Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
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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 |
361,600,000
GBP
|
245,300,000
GBP
|
104,000,000
GBP
|
356,900,000
GBP
|
4,700,000
GBP
|
7. 6
GBP
|
328,400,000
GBP
|
7. 6
GBP
|
211,900,000
GBP
|
4,300,000
GBP
|
104,600,000
GBP
|
32 4. 1
GBP
|
211,500,000
GBP
|
377 .5
GBP
|
158,400,000
GBP
|
3 .1
GBP
|
380 .6
GBP
|
7. 6
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |