Statement Of Comprehensive Income [Abstract]
| Concept |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||
| Profit (loss) | — | — | — | — |
396,000,000
GBP
|
— | — | — | — | — | — |
3 4 1
GBP
|
— | — |
| Other comprehensive income [abstract] | ||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
5,000,000
GBP
|
— | — |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
4,000,000
GBP
|
— | — |
| Other comprehensive income | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — | — |
2,000,000
GBP
|
— | — |
| Comprehensive income |
–
GBP
|
–
GBP
|
405,000,000
GBP
|
–
GBP
|
40 5
GBP
|
–
GBP
|
4 05
GBP
|
22,000,000
GBP
|
–
GBP
|
3 21
GBP
|
3 2 1
GBP
|
343,000,000
GBP
|
–
GBP
|
–
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — |
40 5
GBP
|
— | — | — | — | — | — |
3 21
GBP
|
— | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
22,000,000
GBP
|
— | — |