Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2025-03-31 |
As at 2025-03-31 |
2024-04-01 to 2025-03-31 |
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As at 2023-03-31 |
As at 2023-03-31 |
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| Disclosure of fair value measurement [text block] | — | — |
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | |||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | |||||||||||||||||||||||||||||||
| Assets | — |
3,258,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,999,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | |||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of liabilities [abstract] | |||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | |||||||||||||||||||||||||||||||
| Liabilities | — |
1,359,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,263,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, liabilities [abstract] | |||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | |||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | |||||||||||||||||||||||||||||||
| Equity |
3,300,000
GBP
|
1,899,400,000
GBP
|
— |
–
GBP
|
200,000
GBP
|
23,600,000
GBP
|
46,900,000
GBP
|
38,000,000
GBP
|
1,792,400,000
GBP
|
300,000
GBP
|
88,500,000
GBP
|
3,200,000
GBP
|
1,604,500,000
GBP
|
–
GBP
|
23,600,000
GBP
|
38,000,000
GBP
|
58,000,000
GBP
|
200,000
GBP
|
1,736,500,000
GBP
|
1,300,000
GBP
|
126,300,000
GBP
|
1,598,900,000
GBP
|
23,600,000
GBP
|
46,100,000
GBP
|
200,000
GBP
|
600,000
GBP
|
38,000,000
GBP
|
100,000
GBP
|
1,415,800,000
GBP
|
162,300,000
GBP
|
4,400,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |