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Cash and Cash Equivalents - Schedule of Detailed Information About Cash and Cash Equivalents (Detail) - GBP (£)
£ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Cash And Cash Equivalents [Abstract]        
Cash and cash equivalents £ 19,503 £ 24,251 £ 8,443 £ 6,749