Pensions and other post-retirement benefit obligations - Narrative (Details) £ in Millions |
Sep. 30, 2025
GBP (£)
plan
|
Mar. 31, 2025
GBP (£)
|
|---|---|---|
| Disclosure of defined benefit plans [line items] | ||
| Irrecoverable surplus | £ 221 | £ 77 |
| Number of other post-employment benefit plan | plan | 1 | |
| UK | ||
| Disclosure of defined benefit plans [line items] | ||
| Funding surplus/(deficit) | £ 1,041 | 1,179 |
| US | ||
| Disclosure of defined benefit plans [line items] | ||
| Funding surplus/(deficit) | 1,383 | 1,310 |
| US | Post-employment medical defined benefit plans | ||
| Disclosure of defined benefit plans [line items] | ||
| Irrecoverable surplus | £ 221 | £ 77 |