Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2021-04-01 to 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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||
| Equity | — | — | — | — |
231,200,000
GBP
|
294,800,000
GBP
|
918,500,000
GBP
|
345,100,000
GBP
|
— |
1,789,600,000
GBP
|
231,200,000
GBP
|
1,530,700,000
GBP
|
267,200,000
GBP
|
763,100,000
GBP
|
269,200,000
GBP
|
— | — | — | — | — |
231,200,000
GBP
|
1,302,400,000
GBP
|
595,500,000
GBP
|
241,300,000
GBP
|
234,400,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
155,900,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
155,900,000
GBP
|
— | — | — | — | — | — |
–
GBP
|
108,300,000
GBP
|
–
GBP
|
–
GBP
|
108,300,000
GBP
|
— | — | — | — | — |
| Comprehensive income |
–
GBP
|
155,900,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
155,900,000
GBP
|
— | — | — | — | — | — |
–
GBP
|
108,300,000
GBP
|
–
GBP
|
–
GBP
|
108,300,000
GBP
|
— | — | — | — | — |
| Issue of equity |
155,700,000
GBP
|
–
GBP
|
–
GBP
|
26,900,000
GBP
|
— | — | — | — |
182,600,000
GBP
|
— | — | — | — | — | — |
–
GBP
|
186,000,000
GBP
|
24,200,000
GBP
|
161,800,000
GBP
|
–
GBP
|
— | — | — | — | — |