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 |
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 |
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 |
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 | — | — | — | — | — | — |
3,000,000
GBP
|
700,000
GBP
|
47,100,000
GBP
|
60,900,000
GBP
|
231,400,000
GBP
|
772,800,000
GBP
|
— |
1,1 08.5
GBP
|
1. 5
GBP
|
587 8
GBP
|
899,400,000
GBP
|
47,000,000
GBP
|
228 5
GBP
|
1,400,000
GBP
|
39. 0
GBP
|
— | — | — | — | — | — | — |
81,500,000
GBP
|
719,900,000
GBP
|
700,000
GBP
|
51,400,000
GBP
|
–
GBP
|
44,600,000
GBP
|
543,100,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
–
GBP
|
230 0
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
230. 0
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
125,500,000
GBP
|
–
GBP
|
–
GBP
|
125 5
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — |
43,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
64,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
–
GBP
|
–
GBP
|
21,900,000
GBP
|
250 9
GBP
|
–
GBP
|
1,100,000
GBP
|
— | — | — | — | — | — |
2 73.9
GBP
|
— | — | — | — | — | — | — | — |
42,500,000
GBP
|
–
GBP
|
61,300,000
GBP
|
–
GBP
|
–
GBP
|
107 3
GBP
|
3,500,000
GBP
|
— | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
176,100,000
GBP
|
2,200,000
GBP
|
173 9
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
–
GBP
|
–
GBP
|
76,200,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
76,200,000
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
7 1.2
GBP
|
–
GBP
|
–
GBP
|
71,200,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
–
GBP
|
–
GBP
|
9 9
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
9,900,000
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
7,000,000
GBP
|
–
GBP
|
–
GBP
|
7 0
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Amount removed from reserve of cash flow hedges and included in initial cost or other carrying amount of non-financial asset (liability) or firm commitment for which fair value hedge accounting is applied |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
500,000
GBP
|
— | — | — | — | — | — |
500,000
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
2,700,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
2,700,000
GBP
|
— | — | — | — | — | — | — |