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 |
9 74.4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
888. 4
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 |
5 2 8 . 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
459,200,000
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 |
446 .0
GBP
|
2 3 .1
GBP
|
400,000
GBP
|
42 0.5
GBP
|
2,000,000
GBP
|
0 .4
GBP
|
2,000,000
GBP
|
20,000,000
GBP
|
40 6.8
GBP
|
429. 2
GBP
|
40 6.8
GBP
|
20,000,000
GBP
|
2,000,000
GBP
|
42 9. 2
GBP
|
400,000
GBP
|
2,000,000
GBP
|
0 .4
GBP
|
15,700,000
GBP
|
32 1.6
GBP
|
30 3.5
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |