Statement Of Financial Position [Abstract]
| Concept |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — | — |
21,700,000
GBP
|
21,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investment property | — | — | — | — | — | — | — |
32,700,000
GBP
|
34,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — | — | — | — |
3,900,400,000
GBP
|
3,561,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||
| Cash and cash equivalents | — | — | — | — | — | — | — |
189,400,000
GBP
|
204,300,000
GBP
|
— | — | — | — | — | — | — |
218,000,000
GBP
|
— | — | — | — | — | — | — |
| Current assets | — | — | — | — | — | — | — |
351,000,000
GBP
|
341,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — | — |
4,251,400,000
GBP
|
3,902,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Issued capital | — | — | — | — | — | — | — |
156. 8
GBP
|
156. 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — | — |
41,200,000
GBP
|
32,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — | — |
4 5. 7
GBP
|
45. 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares | — | — | — | — | — | — | — |
25,300,000
GBP
|
36 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
36,300,000
GBP
|
41,200,000
GBP
|
45,700,000
GBP
|
156 .8
GBP
|
25,300,000
GBP
|
10,600,000
GBP
|
3,548,300,000
GBP
|
3,7 31.2
GBP
|
3,573,300,000
GBP
|
32,200,000
GBP
|
10,300,000
GBP
|
36,300,000
GBP
|
45,700,000
GBP
|
156 . 8
GBP
|
36. 7
GBP
|
3,393,100,000
GBP
|
3,721,700,000
GBP
|
9,400,000
GBP
|
4 5.7
GBP
|
36,300,000
GBP
|
29,100,000
GBP
|
46,300,000
GBP
|
156 .8
GBP
|
3,548,900,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||
| Non-current provisions | — | — | — | — | — | — | — |
3,000,000
GBP
|
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — | — | — | — | — |
100,000
GBP
|
0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — | — | — | — |
196 .4
GBP
|
143,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||
| Current liabilities | — | — | — | — | — | — | — |
323,800,000
GBP
|
185 .0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |