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 | — | — | — | — | — |
1,702, 718
GBP
|
— | — | — | — | — | — |
1,663,363,000
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 | — | — | — | — | — |
1,075,675,000
GBP
|
— | — | — | — | — | — |
1,0 34,447
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 |
484,129,000
GBP
|
4,632,000
GBP
|
120,4 77
GBP
|
-
GBP
|
17,80 5
GBP
|
627,043,000
GBP
|
483,246,000
GBP
|
19,704,000
GBP
|
857,000
GBP
|
628, 916
GBP
|
4,632,000
GBP
|
120,4 77
GBP
|
628,91 6
GBP
|
483,2 46
GBP
|
857,000
GBP
|
19,704,000
GBP
|
4,632,000
GBP
|
120 ,477
GBP
|
465,596,000
GBP
|
19,556,000
GBP
|
222,000
GBP
|
120 ,477
GBP
|
4,632,000
GBP
|
610, 483
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |