Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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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 |
2 0 7. 9
GBP
|
4 7. 6
GBP
|
700,000
GBP
|
8,900,000
GBP
|
1 7 7. 1
GBP
|
0. 3
GBP
|
26 .1
GBP
|
192 . 5
GBP
|
4 7. 6
GBP
|
8 .9
GBP
|
0. 2
GBP
|
222,400,000
GBP
|
0 . 4
GBP
|
2 6 . 4
GBP
|
21 0. 4
GBP
|
4 7. 6
GBP
|
8 .9
GBP
|
0 . 1
GBP
|
1 . 4
GBP
|
176 . 5
GBP
|
21 .1
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |