Statement Of Financial Position [Abstract]
| 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 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 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 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||
| Property, plant and equipment | — |
103 . 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
14 0. 4
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — |
9,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||
| Cash and cash equivalents | — |
372. 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
298,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Assets | — |
8 , 3 5 9 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
7 ,842.2
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Retained earnings | — |
1,348,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,0 04.4
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Share premium | — |
13,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
13,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Other reserves | — |
4 4.0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
94,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — |
1, 406.2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 ,112.7
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — |
2,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
10 .7
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity |
1,348,800,000
GBP
|
1,408 .5
GBP
|
3,000,000
GBP
|
3 6 .7
GBP
|
1,406 .2
GBP
|
1 3.1
GBP
|
2,300,000
GBP
|
4,300,000
GBP
|
300,000
GBP
|
1,0 04.4
GBP
|
1 0.7
GBP
|
3 .6
GBP
|
1,112,700,000
GBP
|
300,000
GBP
|
13,100,000
GBP
|
13 .1
GBP
|
1,123,400,000
GBP
|
85,400,000
GBP
|
909,400,000
GBP
|
9,200,000
GBP
|
9 .7
GBP
|
918,600,000
GBP
|
13,100,000
GBP
|
84 0.9
GBP
|
46,600,000
GBP
|
1 . 2
GBP
|
300,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||
| Deferred tax liabilities | — |
_
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
900,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||
| Liabilities included in disposal groups classified as held for sale | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
3 4.0
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Liabilities | — |
6, 9 51 . 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
6 ,7 18 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — |
8 , 3 5 9 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
7 ,842.2
GBP
|
— | — | — | — | — | — | — | — | — | — |