Statement Of Changes In Equity [Abstract]
| Concept |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
As at 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 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity | — |
93 .0
GBP
|
977 .3
GBP
|
296,600,000
GBP
|
191,900,000
GBP
|
9,900,000
GBP
|
— |
1,548,900,000
GBP
|
— | — | — | — | — |
1,787,700,000
GBP
|
295,500,000
GBP
|
191,600,000
GBP
|
9 .9
GBP
|
— | — | — |
1,219,500,000
GBP
|
— | — |
91. 0
GBP
|
32,600,000
GBP
|
9,900,000
GBP
|
181. 1
GBP
|
1,300,300,000
GBP
|
295,500,000
GBP
|
1,7 99.6
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
— | — | — | — | — |
192,500,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
192,500,000
GBP
|
37 .8
GBP
|
— | — | — | — |
–
GBP
|
37 .8
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
1,300,000
GBP
|
— | — | — | — | — |
1,300,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,300,000
GBP
|
— | — | — | — |
–
GBP
|
900,000
GBP
|
–
GBP
|
— |
400,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
1,300,000
GBP
|
— | — | — | — | — |
191,200,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
192,500,000
GBP
|
36,500,000
GBP
|
— | — | — | — |
–
GBP
|
36,900,000
GBP
|
–
GBP
|
— |
400,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — |
6 7. 1
GBP
|
— | — | — | — |
10 .5
GBP
|
–
GBP
|
–
GBP
|
— |
56,600,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
— | — | — | — | — |
50,600,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
50,600,000
GBP
|
43,900,000
GBP
|
— | — | — | — |
–
GBP
|
43,900,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
700,000
GBP
|
— | — | — | — | — |
3 .0
GBP
|
— |
1 .1
GBP
|
0. 3
GBP
|
— |
0. 9
GBP
|
1,400,000
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
— |
1,400,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |