<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a0641e-00f3-71cd-8d11-e21309909330,g:8a899919-81f4-4b70-a359-6cfe04bfcb14-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.summitplc.com/role/Cover" xlink:type="simple" xlink:href="smmt-20260902.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.summitplc.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_01a0641e-00f3-78a1-b27b-cd9357106deb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesTable_01a0641e-00f3-70ca-b370-a3fb8642d977" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_01a0641e-00f3-78a1-b27b-cd9357106deb" xlink:to="loc_dei_EntityAddressesTable_01a0641e-00f3-70ca-b370-a3fb8642d977" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_01a0641e-00f3-737c-9d08-361e95a2501d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressesAddressTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesTable_01a0641e-00f3-70ca-b370-a3fb8642d977" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_01a0641e-00f3-737c-9d08-361e95a2501d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_01a0641e-00f3-7d43-80dc-2ed4dd0e8714" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AddressTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_01a0641e-00f3-737c-9d08-361e95a2501d" xlink:to="loc_dei_AddressTypeDomain_01a0641e-00f3-7d43-80dc-2ed4dd0e8714" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_FormerAddressMember_01a0641e-00f3-742d-ac6e-e37b1e57b595" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_FormerAddressMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_AddressTypeDomain_01a0641e-00f3-7d43-80dc-2ed4dd0e8714" xlink:to="loc_dei_FormerAddressMember_01a0641e-00f3-742d-ac6e-e37b1e57b595" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressesLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesTable_01a0641e-00f3-70ca-b370-a3fb8642d977" xlink:to="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a0641e-00f3-7e46-9951-a9168c88cb4c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_DocumentType_01a0641e-00f3-7e46-9951-a9168c88cb4c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a0641e-00f3-766b-9349-65d2d7094706" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_DocumentPeriodEndDate_01a0641e-00f3-766b-9349-65d2d7094706" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_01a0641e-00f3-7596-908f-5e79af8aa37b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityRegistrantName_01a0641e-00f3-7596-908f-5e79af8aa37b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_01a0641e-00f3-7aaa-833f-0cfd955eab55" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityIncorporationStateCountryCode_01a0641e-00f3-7aaa-833f-0cfd955eab55" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_01a0641e-00f3-74fd-8094-4c4f5a5e7398" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityFileNumber_01a0641e-00f3-74fd-8094-4c4f5a5e7398" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_01a0641e-00f3-7d60-905f-5e58e5573099" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityTaxIdentificationNumber_01a0641e-00f3-7d60-905f-5e58e5573099" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a0641e-00f3-70bb-97f7-82468839cf6b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityAddressAddressLine1_01a0641e-00f3-70bb-97f7-82468839cf6b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a0641e-00f3-7eaa-9636-e28bd5eff693" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityAddressCityOrTown_01a0641e-00f3-7eaa-9636-e28bd5eff693" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_01a0641e-00f3-7849-b39b-1d354868e19e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityAddressStateOrProvince_01a0641e-00f3-7849-b39b-1d354868e19e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_01a0641e-00f3-7f03-8cda-7835df35d6ef" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityAddressPostalZipCode_01a0641e-00f3-7f03-8cda-7835df35d6ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_01a0641e-00f3-7c8d-83bd-a990d98d0e68" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_CityAreaCode_01a0641e-00f3-7c8d-83bd-a990d98d0e68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_01a0641e-00f3-710c-b8ad-a423a32018c1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_LocalPhoneNumber_01a0641e-00f3-710c-b8ad-a423a32018c1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_01a0641e-00f3-7da2-b252-edeb162a8289" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_WrittenCommunications_01a0641e-00f3-7da2-b252-edeb162a8289" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_01a0641e-00f3-727e-a40e-734acfbffe62" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_SolicitingMaterial_01a0641e-00f3-727e-a40e-734acfbffe62" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_01a0641e-00f3-7120-a006-5869178f3654" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_PreCommencementTenderOffer_01a0641e-00f3-7120-a006-5869178f3654" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_01a0641e-00f3-794b-b1f1-273cda2a1dd2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_01a0641e-00f3-794b-b1f1-273cda2a1dd2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_01a0641e-00f3-779a-b8df-eef8cb09d61c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_Security12bTitle_01a0641e-00f3-779a-b8df-eef8cb09d61c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_01a0641e-00f3-71fa-ba3b-39d0f1f1c3d1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_TradingSymbol_01a0641e-00f3-71fa-ba3b-39d0f1f1c3d1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_01a0641e-00f3-7e21-8a80-7b0452b0118d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_SecurityExchangeName_01a0641e-00f3-7e21-8a80-7b0452b0118d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_01a0641e-00f3-73c2-9c01-48d38537a683" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityEmergingGrowthCompany_01a0641e-00f3-73c2-9c01-48d38537a683" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_01a0641e-00f3-764a-a25e-d8a5818bdda1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_EntityCentralIndexKey_01a0641e-00f3-764a-a25e-d8a5818bdda1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_01a0641e-00f3-7131-8070-33d7b62bae0e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityAddressesLineItems_01a0641e-00f3-74e9-8b45-3000d612d082" xlink:to="loc_dei_AmendmentFlag_01a0641e-00f3-7131-8070-33d7b62bae0e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
