Lease liabilities - Cash outflows related to leases (Details) - GBP (£) £ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Lease liabilities
Right of use assets	£ 1,037	£ 771	£ 669
Short term leases	54	63
Total cash outflow	£ 1,091	£ 834

The cash outflow for leases.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	xbrli:monetaryItemType
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