Statement Of Changes In Equity [Abstract]
| Concept |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 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 |
As at 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 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||
| Equity |
247,400,000
GBP
|
— |
10,400,000
GBP
|
— |
576,900,000
GBP
|
10,200,000
GBP
|
— | — | — |
357,800,000
GBP
|
8,000,000
GBP
|
— |
3,200,000
GBP
|
— | — |
23. 3
GBP
|
— | — | — | — | — | — |
400,000
GBP
|
17,800,000
GBP
|
— |
8,000,000
GBP
|
10,200,000
GBP
|
200,000
GBP
|
224,500,000
GBP
|
— |
409,200,000
GBP
|
200,500,000
GBP
|
124,500,000
GBP
|
162,600,000
GBP
|
285,300,000
GBP
|
700,000
GBP
|
8,000,000
GBP
|
9,400,000
GBP
|
–
GBP
|
2,500,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
114,000,000
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
114,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
32,900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
32,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
14,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
— |
–
GBP
|
— | — |
3. 0
GBP
|
–
GBP
|
114,000,000
GBP
|
— | — |
5,500,000
GBP
|
— |
–
GBP
|
111,500,000
GBP
|
— |
–
GBP
|
2,700,000
GBP
|
32,900,000
GBP
|
–
GBP
|
17,200,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
18,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
800,000
GBP
|
— | — |
800,000
GBP
|
— | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
300,000
GBP
|
— | — |
–
GBP
|
— |
58,000,000
GBP
|
57,700,000
GBP
|
— |
42,500,000
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
43,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |