Disclosure Of Fair Value Measurement [Text Block]
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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 | — |
12, 212.1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
11, 118.5
GBP
|
— | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [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 |
9 . 5
GBP
|
373. 6
GBP
|
0. 2
GBP
|
6 7. 5
GBP
|
403,700,000
GBP
|
3 68 .0
GBP
|
373 . 4
GBP
|
3 2 1 . 3
GBP
|
10. 7
GBP
|
3 6 7. 4
GBP
|
3 30. 5
GBP
|
0. 2
GBP
|
418 .7
GBP
|
4 9 . 8
GBP
|
3 67. 6
GBP
|
32 1 . 3
GBP
|
349. 8
GBP
|
349,900,000
GBP
|
4 41 . 2
GBP
|
5 1 . 4
GBP
|
32 1 . 3
GBP
|
100,000
GBP
|
28 7. 9
GBP
|
6 . 6
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |