Statement Of Changes In Equity [Abstract]
| Concept |
2024-04-01 to 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
As at 2025-03-31 |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
As at 2024-03-31 |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
2023-04-01 to 2024-03-31 |
As at 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 |
As at 2024-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity | — |
2,900,000
GBP
|
308,000,000
GBP
|
— |
192,000,000
GBP
|
— |
4,800,000
GBP
|
114,100,000
GBP
|
— | — |
5,800,000
GBP
|
— |
2,900,000
GBP
|
— |
104,000,000
GBP
|
192,000,000
GBP
|
4,800,000
GBP
|
— |
301,600,000
GBP
|
— | — | — | — |
2,100,000
GBP
|
303,600,000
GBP
|
192,000,000
GBP
|
4,800,000
GBP
|
98,300,000
GBP
|
2,900,000
GBP
|
5,600,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
— | — |
24,600,000
GBP
|
— |
24,600,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
15,500,000
GBP
|
— |
–
GBP
|
–
GBP
|
15,500,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
–
GBP
|
— | — |
7,200,000
GBP
|
— |
3,500,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— |
3,700,000
GBP
|
— |
–
GBP
|
— | — | — |
8,600,000
GBP
|
— |
–
GBP
|
–
GBP
|
900,000
GBP
|
7,700,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
–
GBP
|
— | — |
17,400,000
GBP
|
— |
21,100,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— |
3,700,000
GBP
|
— |
–
GBP
|
— | — | — |
6,900,000
GBP
|
— |
–
GBP
|
–
GBP
|
14,600,000
GBP
|
7,700,000
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
— | — |
11,700,000
GBP
|
— |
11,700,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
11,200,000
GBP
|
— |
–
GBP
|
–
GBP
|
11,200,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
— | — |
700,000
GBP
|
— |
700,000
GBP
|
— | — |
–
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
2,300,000
GBP
|
— |
–
GBP
|
–
GBP
|
2,300,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |