Financial instruments - Summary of deferred gains and losses on cash flow hedges currently expected to recognized in future periods (Details) - Foreign currency hedge reserve - GBP (£) £ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Disclosure of detailed information about financial instruments | |||
| Reserve of cash flow hedges, before tax | £ 46 | £ 28 | £ 40 |
| Principal amount of hedges | 1,306 | ||
| Within 1 year | |||
| Disclosure of detailed information about financial instruments | |||
| Reserve of cash flow hedges, before tax | £ 20 | ||
| Principal amount of hedges | 563 | ||
| Within 1 to 2 years | |||
| Disclosure of detailed information about financial instruments | |||
| Reserve of cash flow hedges, before tax | £ 20 | ||
| Principal amount of hedges | 495 | ||
| Within 2 to 3 years | |||
| Disclosure of detailed information about financial instruments | |||
| Reserve of cash flow hedges, before tax | £ 6 | ||
| Principal amount of hedges | 234 | ||
| Within 3 to 4 years | |||
| Disclosure of detailed information about financial instruments | |||
| Principal amount of hedges | 14 |