Disclosure Of Fair Value Measurement [Text Block]
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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 |
19 8 . 3
GBP
|
78,500,000
GBP
|
706,000,000
GBP
|
1,306 .8
GBP
|
1 7 7. 4
GBP
|
432 . 2
GBP
|
2 1.5
GBP
|
47. 7
GBP
|
15 3. 4
GBP
|
–
GBP
|
8 7. 2
GBP
|
4 7. 5
GBP
|
6 9 7. 3
GBP
|
430 .0
GBP
|
76. 0
GBP
|
1, 3 39.4
GBP
|
–
GBP
|
706 .6
GBP
|
429. 6
GBP
|
1,7 15.6
GBP
|
3 69. 7
GBP
|
4 7. 4
GBP
|
40. 8
GBP
|
12 1. 5
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |