Statement Of Changes In Equity [Abstract]
| Concept |
As at 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 |
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 |
2021-04-01 to 2022-03-31 |
As at 2022-03-31 |
2021-04-01 to 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 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
As at 2021-03-31 |
2020-04-01 to 2021-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||
| Equity |
–
GBP
|
— | — | — | — | — |
1,400. 0
GBP
|
100,000
GBP
|
1 0.0
GBP
|
7. 0
GBP
|
1 ,7 1 1 . 3
GBP
|
— |
328 . 2
GBP
|
— |
–
GBP
|
— |
–
GBP
|
1,400. 0
GBP
|
1 4 9.7
GBP
|
10. 0
GBP
|
–
GBP
|
1 , 5 3 7. 1
GBP
|
2 .7
GBP
|
— | — | — | — | — | — | — |
100,000
GBP
|
— |
–
GBP
|
–
GBP
|
1 0.1
GBP
|
70 . 5
GBP
|
16 5. 8
GBP
|
1 . 5
GBP
|
–
GBP
|
22 4 .7
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
1 81 . 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
181 . 2
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3 4 .7
GBP
|
–
GBP
|
–
GBP
|
— |
3 4.7
GBP
|
— | — | — | — | — | — | — | — |
| Other comprehensive income | — |
4. 3
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
4. 3
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
7. 4
GBP
|
–
GBP
|
–
GBP
|
9. 0
GBP
|
1 . 6
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — |
4. 3
GBP
|
18 1 . 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
185 .5
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
7. 4
GBP
|
–
GBP
|
–
GBP
|
25 .7
GBP
|
1 . 6
GBP
|
–
GBP
|
— |
3 4.7
GBP
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
1 2. 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
12 . 2
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
5. 2
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
5 . 2
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1 1. 5
GBP
|
–
GBP
|
–
GBP
|
— |
1 1. 5
GBP
|
— | — | — | — | — | — | — | — |