Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 2025-03-31 |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
2024-04-01 to 2025-03-31 |
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 |
As at 2024-03-31 |
As at 2024-03-31 |
2023-04-01 to 2024-03-31 |
As at 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 |
2023-04-01 to 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 |
As at 2023-03-31 |
As at 2023-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||
| Equity |
9 . 5
GBP
|
— |
373. 6
GBP
|
— |
0. 2
GBP
|
6 7. 5
GBP
|
— |
403,700,000
GBP
|
— | — |
3 68 .0
GBP
|
— |
373 . 4
GBP
|
3 2 1 . 3
GBP
|
— | — | — |
10. 7
GBP
|
3 6 7. 4
GBP
|
3 30. 5
GBP
|
— |
0. 2
GBP
|
418 .7
GBP
|
4 9 . 8
GBP
|
— |
3 67. 6
GBP
|
32 1 . 3
GBP
|
— | — | — | — | — |
349. 8
GBP
|
349,900,000
GBP
|
4 41 . 2
GBP
|
5 1 . 4
GBP
|
100,000
GBP
|
28 7. 9
GBP
|
32 1 . 3
GBP
|
6 . 6
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
1 50 .1
GBP
|
— |
1 50 .1
GBP
|
— | — |
1 50 .1
GBP
|
— |
—
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — |
163,800,000
GBP
|
— | — | — |
163,900,000
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
16 3.8
GBP
|
100,000
GBP
|
— | — | — | — | — | — | — | — |
| Other comprehensive income | — |
—
GBP
|
— |
—
GBP
|
— | — |
1 . 2
GBP
|
— |
—
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
1,200,000
GBP
|
6 . 5
GBP
|
— | — | — |
6. 3
GBP
|
— | — | — |
6 . 3
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
0. 2
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — |
1 5 0.1
GBP
|
— |
1 50 .1
GBP
|
— | — |
148. 9
GBP
|
— |
—
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
1,200,000
GBP
|
6 . 5
GBP
|
— | — | — |
1 5 7. 5
GBP
|
— | — | — |
1 5 7. 6
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
16 4.0
GBP
|
100,000
GBP
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
1 07. 2
GBP
|
— |
1 0 7. 2
GBP
|
— | — |
1 07. 2
GBP
|
— |
—
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — |
11 5 . 8
GBP
|
— | — | — |
11 5 . 8
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
11 5 . 8
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — |
1 9 .0
GBP
|
— |
1 9. 0
GBP
|
— | — |
4 . 0
GBP
|
— |
—
GBP
|
—
GBP
|
— |
1 5 .0
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — |
28 . 2
GBP
|
— | — | — |
28 . 2
GBP
|
— | — |
2 2 . 5
GBP
|
—
GBP
|
—
GBP
|
5 .7
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
16. 2
GBP
|
— |
16. 2
GBP
|
— | — |
—
GBP
|
— |
—
GBP
|
—
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
16,200,000
GBP
|
16,500,000
GBP
|
— | — | — |
1 6.5
GBP
|
— | — | — |
16,500,000
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |