Statement Of Changes In Equity [Abstract]
| Concept |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
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 |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||
| Equity | — | — | — | — |
375,400,000
GBP
|
378,600,000
GBP
|
2,400,000
GBP
|
3,100,000
GBP
|
— | — |
2,300,000
GBP
|
— | — | — | — |
2,300,000
GBP
|
412,200,000
GBP
|
— | — | — |
3,100,000
GBP
|
1,100,000
GBP
|
— |
414,100,000
GBP
|
2,300,000
GBP
|
460,400,000
GBP
|
3,100,000
GBP
|
227,400,000
GBP
|
232,200,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
20,600,000
GBP
|
37,400,000
GBP
|
16,800,000
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
— |
16,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
18,200,000
GBP
|
8,400,000
GBP
|
26,600,000
GBP
|
— | — |
26,600,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income |
–
GBP
|
— | — |
16,800,000
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
— |
16. 8
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
26,600,000
GBP
|
— | — |
26,600,000
GBP
|
— | — | — | — | — | — |
| Issue of equity |
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
1,300,000
GBP
|
–
GBP
|
— |
1,300,000
GBP
|
1,100,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
— | — |
1,100,000
GBP
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
— | — |
20,900,000
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
— |
20,900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
21,700,000
GBP
|
— | — |
21,700,000
GBP
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
— | — |
0 .9
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
— |
900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — |
900,000
GBP
|
— | — |
900,000
GBP
|
— | — | — | — | — | — |