Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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 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 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 |
248,100,000
GBP
|
394,400,000
GBP
|
473,000,000
GBP
|
1,263,900,000
GBP
|
148,400,000
GBP
|
651,700,000
GBP
|
101,700,000
GBP
|
1,138,700,000
GBP
|
237,200,000
GBP
|
148,100,000
GBP
|
67,900,000
GBP
|
1,243,700,000
GBP
|
137,000,000
GBP
|
236,500,000
GBP
|
802,300,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |