v3.25.4
Additional cash flow information - Summary of Current and Non-current Borrowings (Detail) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance £ 1,479 £ 1,153
Fair value and other movements 3 0
Foreign exchange movements (32) 14
Financing cash flows (34) 266
Transfer from non-current to current 0 0
New leases/ disposal of leases 52 46
Ending balance 1,468 1,479
Long-term borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 1,141 1,100
Fair value and other movements 5 (8)
Foreign exchange movements (12) 3
Financing cash flows 297 344
Transfer from non-current to current (76) (344)
New leases/ disposal of leases 52 46
Ending balance 1,407 1,141
Short-term borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 338 53
Fair value and other movements (2) 8
Foreign exchange movements (20) 11
Financing cash flows (331) (78)
Transfer from non-current to current 76 344
New leases/ disposal of leases 0 0
Ending balance £ 61 £ 338