Trade and Other Receivables - Summary of Movements on Provision for Bad and Doubtful Debts (Detail) - GBP (£) £ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of other provisions [abstract] | ||
| At beginning of year | £ (40) | £ (51) |
| Exchange differences | 1 | 2 |
| Income statement movements | (24) | (4) |
| Utilised | 7 | 13 |
| At end of year | £ (56) | £ (40) |