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 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 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 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — | — | — |
183,700,000
GBP
|
176,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — | — | — | — | — |
27,000,000
GBP
|
22,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — | — | — |
43,600,000
GBP
|
17,000,000
GBP
|
— | — | — | — | — | — | — | — |
50,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — | — | — |
993,000,000
GBP
|
978,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital | — | — | — | — | — | — | — | — |
200,000
GBP
|
200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — | — | — |
431,900,000
GBP
|
425,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — | — | — |
93,600,000
GBP
|
93,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — | — | — | — |
116,500,000
GBP
|
116,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
1,100,000
GBP
|
431,900,000
GBP
|
93,600,000
GBP
|
200,000
GBP
|
200,000
GBP
|
–
GBP
|
116,500,000
GBP
|
100,000
GBP
|
643,000,000
GBP
|
636,600,000
GBP
|
425,200,000
GBP
|
1,100,000
GBP
|
116,500,000
GBP
|
93,600,000
GBP
|
200,000
GBP
|
100,000
GBP
|
–
GBP
|
100,000
GBP
|
627,100,000
GBP
|
116,500,000
GBP
|
93,600,000
GBP
|
1,100,000
GBP
|
415,700,000
GBP
|
–
GBP
|
200,000
GBP
|
–
GBP
|
–
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Liabilities included in disposal groups classified as held for sale | — | — | — | — | — | — | — | — |
–
GBP
|
2,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — | — | — |
350,000,000
GBP
|
342,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |