Statement Of Changes In Equity [Abstract]
| Concept |
2023-04-01 to 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 |
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 |
As at 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 |
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 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
As at 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 | — |
108,300,000
GBP
|
1,432,300,000
GBP
|
1,038,900,000
GBP
|
— |
600,000
GBP
|
1,800,000
GBP
|
— |
1,432,900,000
GBP
|
— | — |
286,900,000
GBP
|
— | — | — | — |
1,344,200,000
GBP
|
1,344,900,000
GBP
|
2,200,000
GBP
|
— | — | — |
283,300,000
GBP
|
954,300,000
GBP
|
700,000
GBP
|
— | — |
108,800,000
GBP
|
60,200,000
GBP
|
3,000,000
GBP
|
1,108,500,000
GBP
|
772,800,000
GBP
|
278,500,000
GBP
|
–
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
— | — | — |
183,700,000
GBP
|
— | — |
183,700,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
183,700,000
GBP
|
–
GBP
|
284,800,000
GBP
|
284,800,000
GBP
|
— | — | — |
284,800,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
700,000
GBP
|
— | — | — |
–
GBP
|
— | — |
100,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
700,000
GBP
|
100,000
GBP
|
25,300,000
GBP
|
25,300,000
GBP
|
— | — | — |
26,300,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
51,600,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
700,000
GBP
|
— | — | — |
183,700,000
GBP
|
— | — |
183,600,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
184,400,000
GBP
|
100,000
GBP
|
310,100,000
GBP
|
310,100,000
GBP
|
— | — | — |
258,500,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
51,600,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
— | — | — |
104,100,000
GBP
|
— | — |
104,100,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
104,100,000
GBP
|
–
GBP
|
88,600,000
GBP
|
88,600,000
GBP
|
— | — | — |
88,600,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
700,000
GBP
|
— | — | — |
700,000
GBP
|
–
GBP
|
700,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
— | — | — |
7,800,000
GBP
|
— | — |
7,800,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
7,800,000
GBP
|
–
GBP
|
14,200,000
GBP
|
14,200,000
GBP
|
— | — | — |
14,200,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
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 |
1,600,000
GBP
|
— | — | — |
1,600,000
GBP
|
— | — |
1,600,000
GBP
|
— |
–
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
3,700,000
GBP
|
3,700,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
3,700,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |