Statement Of Changes In Equity [Abstract]
| Concept |
As at 2024-03-31 |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
As at 2024-03-31 |
2023-04-01 to 2024-03-31 |
As at 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
2023-04-01 to 2024-03-31 |
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 |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
2022-04-01 to 2023-03-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||
| Equity |
2,300,000
GBP
|
— |
359,300,000
GBP
|
4,000,000
GBP
|
3,100,000
GBP
|
3,000,000
GBP
|
— |
361,100,000
GBP
|
— | — | — | — | — | — |
378,600,000
GBP
|
2,400,000
GBP
|
3,100,000
GBP
|
–
GBP
|
— | — | — |
375,400,000
GBP
|
2,300,000
GBP
|
— |
–
GBP
|
2,300,000
GBP
|
412,200,000
GBP
|
3,100,000
GBP
|
1,100,000
GBP
|
414,100,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
— | — | — | — |
3,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
3,000,000
GBP
|
16,800,000
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
16,800,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
— | — | — | — |
3,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
3,000,000
GBP
|
16,800,000
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
16,800,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — |
| Issue of equity | — |
–
GBP
|
— | — | — | — |
1,600,000
GBP
|
— |
1,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,300,000
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
–
GBP
|
1,300,000
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
— | — | — | — |
20,300,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
20,300,000
GBP
|
20,900,000
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
20,900,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
— | — | — | — |
1,200,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
1,200,000
GBP
|
900,000
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
900,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — | — | — |