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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity | — | — | — | — | — |
2 .9
GBP
|
7. 6
GBP
|
62 .5
GBP
|
243. 2
GBP
|
— |
316. 4
GBP
|
0. 2
GBP
|
19 4.1
GBP
|
0. 2
GBP
|
26 6. 2
GBP
|
2. 9
GBP
|
62 .4
GBP
|
6,600,000
GBP
|
— | — | — | — | — | — |
0. 2
GBP
|
251 .6
GBP
|
11 .5
GBP
|
62. 2
GBP
|
2,900,000
GBP
|
1 74 . 8
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) |
—
GBP
|
—
GBP
|
38,600,000
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — |
38,600,000
GBP
|
— | — | — | — | — | — | — | — |
—
GBP
|
—
GBP
|
41 . 8
GBP
|
—
GBP
|
—
GBP
|
41 . 8
GBP
|
— | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — |
21 .5
GBP
|
— | — | — | — | — | — | — | — | — | — |
30. 2
GBP
|
— | — | — | — | — | — | — | — | — |
| Issue of equity |
0. 1
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — |
0. 1
GBP
|
— | — | — | — | — | — | — | — |
—
GBP
|
—
GBP
|
0. 2
GBP
|
—
GBP
|
0. 2
GBP
|
—
GBP
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners |
—
GBP
|
—
GBP
|
12 .3
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — |
12 . 3
GBP
|
— | — | — | — | — | — | — | — |
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
—
GBP
|
—
GBP
|
2,100,000
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — |
2 .1
GBP
|
— | — | — | — | — | — | — | — |
—
GBP
|
—
GBP
|
1,800,000
GBP
|
—
GBP
|
—
GBP
|
1 .8
GBP
|
— | — | — | — | — | — |