Pension schemes - Schedule of defined benefit pension scheme (Detail) - GBP (£) £ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of defined benefit plans | |||
| Service cost | £ 2 | £ 4 | £ 5 |
| Past service cost/(settlement credit) | 1 | ||
| Defined benefit pension expense | 3 | 4 | 5 |
| Net interest on net defined benefit pension balance | (3) | 1 | 1 |
| Net defined benefit pension expense/(credit) | 5 | 6 | |
| United Kingdom | |||
| Disclosure of defined benefit plans | |||
| Service cost | 1 | 2 | |
| Past service cost/(settlement credit) | 5 | ||
| Defined benefit pension expense | 5 | 1 | 2 |
| Net interest on net defined benefit pension balance | (3) | 1 | |
| Net defined benefit pension expense/(credit) | 2 | 1 | 3 |
| United States | |||
| Disclosure of defined benefit plans | |||
| Service cost | 2 | 3 | 3 |
| Past service cost/(settlement credit) | (4) | ||
| Defined benefit pension expense | (2) | 3 | 3 |
| Net interest on net defined benefit pension balance | 1 | ||
| Net defined benefit pension expense/(credit) | £ (2) | £ 4 | £ 3 |