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Cash and Cash Equivalents (Excluding Overdrafts) - Summary of Cash and Cash Equivalents (Detail) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash and cash equivalents [line items]        
Cash at bank and in hand £ 327 £ 444    
Short-term bank deposits 6 99    
Total 333 543    
Cash and cash equivalents 333 543    
Bank overdrafts 0 0    
Cash and cash equivalents in the cash flow statement £ 333 £ 543 £ 309 £ 543