Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Property, plant and equipment | — | — | — |
1 40.5
GBP
|
— | — |
1 1 8.6
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — | — | — |
1. 0
GBP
|
— | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current tax assets | — | — | — |
—
GBP
|
— | — |
21 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — |
11 . 5
GBP
|
— | — |
1 0.5
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
420,100,000
GBP
|
— | — |
86 1 .6
GBP
|
— | — | — | — | — | — | — |
1 ,2 46.6
GBP
|
— | — | — |
| Assets | — | — | — |
4,7 87 .8
GBP
|
— | — |
5,03 4.1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital | — | — | — |
31 . 9
GBP
|
— | — |
31 . 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
2,847 .7
GBP
|
— | — |
2,868,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — |
25,600,000
GBP
|
— | — |
25,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
25,600,000
GBP
|
31 . 9
GBP
|
2,847 .7
GBP
|
3,4 1 8.5
GBP
|
236,500,000
GBP
|
27 6.8
GBP
|
3,439,300,000
GBP
|
25,600,000
GBP
|
2 36.5
GBP
|
2,868,500,000
GBP
|
31 . 9
GBP
|
2 7 6.8
GBP
|
3,055,100,000
GBP
|
236,500,000
GBP
|
3,6 25.2
GBP
|
2 7 6.8
GBP
|
2 4.9
GBP
|
31 . 9
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Current tax liabilities | — | — | — |
100,000
GBP
|
— | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — |
64,900,000
GBP
|
— | — |
72,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
1 ,369.3
GBP
|
— | — |
1 ,59 4.8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |