Leases - Additional information (Detail) - GBP (£) £ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Presentation Of Leases For Lessee [Line Items] | |||
| Contractual capital commitments | £ 11 | £ 14 | |
| Finance lease receivable increased (decreased) | (17) | (17) | |
| Impairment loss recognised in profit or loss, right-of-use assets | 1 | ||
| Reversal of impairment loss recognised in profit or loss, right-of-use assets | 11 | ||
| Depreciation | £ 4 | £ 3 | £ 2 |