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 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 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 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Property, plant and equipment |
21 .6
GBP
|
— | — | — | — | — | — | — |
20,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investment property |
34,100,000
GBP
|
— | — | — | — | — | — | — |
37 .9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
204,300,000
GBP
|
— | — | — | — | — | — | — |
21 8.0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
325,900,000
GBP
|
— | — |
| Assets |
3,902,100,000
GBP
|
— | — | — | — | — | — | — |
4,1 7 1 .5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Issued capital |
1 56.8
GBP
|
— | — | — | — | — | — | — |
156,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
32,200,000
GBP
|
— | — | — | — | — | — | — |
29,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
45,700,000
GBP
|
— | — | — | — | — | — | — |
45,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares |
36,700,000
GBP
|
— | — | — | — | — | — | — |
46,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
3,573,300,000
GBP
|
32,200,000
GBP
|
10,300,000
GBP
|
36,300,000
GBP
|
45,700,000
GBP
|
156,800,000
GBP
|
36,700,000
GBP
|
3,393,100,000
GBP
|
3,721 .7
GBP
|
9,400,000
GBP
|
45,700,000
GBP
|
36,300,000
GBP
|
29,100,000
GBP
|
46,300,000
GBP
|
156,800,000
GBP
|
3,548,900,000
GBP
|
23,000,000
GBP
|
4,1 7 4.4
GBP
|
1 1 .4
GBP
|
36,300,000
GBP
|
11. 5
GBP
|
4,390,300,000
GBP
|
45,700,000
GBP
|
1 56.8
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Deferred tax liabilities |
0
GBP
|
— | — | — | — | — | — | — |
200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |