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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e82be-4a44-7c7a-9087-22d5bd24fc30,g:d12d6bb9-c5ad-46e0-b125-8f602cef4c06-->
<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-20260530.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_019e82be-4a44-7ee9-8e68-a97b9f4b97e3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesTable_019e82be-4a44-7365-9371-bb8e2db74559" 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_019e82be-4a44-7ee9-8e68-a97b9f4b97e3" xlink:to="loc_dei_EntityAddressesTable_019e82be-4a44-7365-9371-bb8e2db74559" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_019e82be-4a44-76bc-8e2e-1968e2488037" 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_019e82be-4a44-7365-9371-bb8e2db74559" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_019e82be-4a44-76bc-8e2e-1968e2488037" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019e82be-4a44-7a88-8e25-c3d0dfa1c5b7" 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_019e82be-4a44-76bc-8e2e-1968e2488037" xlink:to="loc_dei_AddressTypeDomain_019e82be-4a44-7a88-8e25-c3d0dfa1c5b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_FormerAddressMember_019e82be-4a44-7b67-9e1e-2f000e3fd170" 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_019e82be-4a44-7a88-8e25-c3d0dfa1c5b7" xlink:to="loc_dei_FormerAddressMember_019e82be-4a44-7b67-9e1e-2f000e3fd170" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesLineItems_019e82be-4a44-7cea-a873-caf4c2e81a8d" 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_019e82be-4a44-7365-9371-bb8e2db74559" xlink:to="loc_dei_EntityAddressesLineItems_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e82be-4a44-794e-8de2-234cb30df266" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_DocumentType_019e82be-4a44-794e-8de2-234cb30df266" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e82be-4a44-7022-b8d8-bf27b70ea9d5" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_DocumentPeriodEndDate_019e82be-4a44-7022-b8d8-bf27b70ea9d5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e82be-4a44-7101-8549-598dab2ca069" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityRegistrantName_019e82be-4a44-7101-8549-598dab2ca069" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e82be-4a44-7724-b4e3-85270141015e" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e82be-4a44-7724-b4e3-85270141015e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e82be-4a44-75fc-a53d-ddb1fa0923d2" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityFileNumber_019e82be-4a44-75fc-a53d-ddb1fa0923d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e82be-4a44-74c3-8120-bb5dcc164648" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e82be-4a44-74c3-8120-bb5dcc164648" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e82be-4a44-7683-bb1e-9da9ad86608d" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityAddressAddressLine1_019e82be-4a44-7683-bb1e-9da9ad86608d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e82be-4a44-7994-b8ac-d4a73e69c05b" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityAddressCityOrTown_019e82be-4a44-7994-b8ac-d4a73e69c05b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e82be-4a44-7110-b616-bc0c3e84e258" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityAddressStateOrProvince_019e82be-4a44-7110-b616-bc0c3e84e258" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e82be-4a44-7327-b653-43a1ce0c9747" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityAddressPostalZipCode_019e82be-4a44-7327-b653-43a1ce0c9747" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e82be-4a44-7ab1-9833-e33e1c9a4cde" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_CityAreaCode_019e82be-4a44-7ab1-9833-e33e1c9a4cde" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e82be-4a44-7598-b1a9-d834c1158adb" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_LocalPhoneNumber_019e82be-4a44-7598-b1a9-d834c1158adb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019e82be-4a44-71cd-8034-d16c31325f26" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_WrittenCommunications_019e82be-4a44-71cd-8034-d16c31325f26" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019e82be-4a44-7cf5-a1ff-4ff8b34d1f1b" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_SolicitingMaterial_019e82be-4a44-7cf5-a1ff-4ff8b34d1f1b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019e82be-4a44-7319-b902-edb606ba9f0f" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_PreCommencementTenderOffer_019e82be-4a44-7319-b902-edb606ba9f0f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019e82be-4a44-7f47-ac50-543426454aca" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019e82be-4a44-7f47-ac50-543426454aca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e82be-4a44-78f0-a56a-83aa516dfa80" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_Security12bTitle_019e82be-4a44-78f0-a56a-83aa516dfa80" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e82be-4a44-702f-b40d-7d77785e2368" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_TradingSymbol_019e82be-4a44-702f-b40d-7d77785e2368" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e82be-4a44-7c2e-b94e-72363f275922" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_SecurityExchangeName_019e82be-4a44-7c2e-b94e-72363f275922" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e82be-4a44-7997-839c-bc6472ef6f41" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e82be-4a44-7997-839c-bc6472ef6f41" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e82be-4a44-7552-b356-afc4f47a877c" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_EntityCentralIndexKey_019e82be-4a44-7552-b356-afc4f47a877c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e82be-4a44-7103-86cc-6915255ee107" 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_019e82be-4a44-7cea-a873-caf4c2e81a8d" xlink:to="loc_dei_AmendmentFlag_019e82be-4a44-7103-86cc-6915255ee107" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
