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 |
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 |
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 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 |
7,743,000
GBP
|
— | — | — | — |
1,223,000
GBP
|
112,654,000
GBP
|
367,505,000
GBP
|
— |
687,043,000
GBP
|
197,627,000
GBP
|
— |
291,000
GBP
|
— |
7,478,000
GBP
|
164,316,000
GBP
|
326,608,000
GBP
|
291,000
GBP
|
1,478,000
GBP
|
107,990,000
GBP
|
608,161,000
GBP
|
— | — | — | — | — | — | — |
1,465,000
GBP
|
291,000
GBP
|
598,689,000
GBP
|
171,464,000
GBP
|
7,478,000
GBP
|
103,522,000
GBP
|
314,469,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — | — |
88,894,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,877,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
88,894,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
88,894,000
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
17,877,000
GBP
|
–
GBP
|
–
GBP
|
17,877,000
GBP
|
— | — | — | — | — | — | — |
| Issue of equity | — |
4,610,000
GBP
|
–
GBP
|
–
GBP
|
10,000
GBP
|
— | — | — |
4,620,000
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
4,481,000
GBP
|
13,000
GBP
|
4,468,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
12,582,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
12,582,000
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
10,528,000
GBP
|
–
GBP
|
–
GBP
|
10,528,000
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
3,223,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
3,223,000
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
2,031,000
GBP
|
–
GBP
|
–
GBP
|
2,031,000
GBP
|
— | — | — | — | — | — | — |