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] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment | — | — |
28,500,000
GBP
|
— | — | — |
25 .5
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — |
35 .9
GBP
|
— | — | — |
39,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investment property | — | — |
1 .0
GBP
|
— | — | — |
1 .0
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables | — | — |
4,400,000
GBP
|
— | — | — |
2,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — |
16,800,000
GBP
|
— | — | — |
14 .6
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — |
284,600,000
GBP
|
— | — | — |
28 8.9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Trade and other current receivables | — | — |
1 4 7. 5
GBP
|
— | — | — |
150,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — |
398,900,000
GBP
|
— | — | — |
384,400,000
GBP
|
— | — | — | — | — | — |
26 1.6
GBP
|
— | — | — | — |
| Current assets | — | — |
591,000,000
GBP
|
— | — | — |
543. 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital | — | — |
7. 7
GBP
|
— | — | — |
7. 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — |
340,000,000
GBP
|
— | — | — |
2 8 7. 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — |
104,900,000
GBP
|
— | — | — |
114. 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — |
452 .6
GBP
|
— | — | — |
4 0 9.7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — |
4,000,000
GBP
|
— | — | — |
3,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
7. 7
GBP
|
3 40.0
GBP
|
456 .6
GBP
|
104,900,000
GBP
|
452 . 6
GBP
|
4 .0
GBP
|
41 3 . 2
GBP
|
3,500,000
GBP
|
2 8 7. 2
GBP
|
7. 7
GBP
|
409,700,000
GBP
|
114 . 8
GBP
|
24 5 . 3
GBP
|
361,600,000
GBP
|
10 4.0
GBP
|
356 .9
GBP
|
4 .7
GBP
|
7. 6
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Non-current provisions | — | — |
1 . 9
GBP
|
— | — | — |
1 . 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables | — | — |
3 . 2
GBP
|
— | — | — |
5 . 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — |
9 . 4
GBP
|
— | — | — |
7. 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — |
4 7. 7
GBP
|
— | — | — |
52 . 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions | — | — |
0. 6
GBP
|
— | — | — |
0 . 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — | — |
3 3 9 .4
GBP
|
— | — | — |
3 3 5 . 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — |
37 1. 3
GBP
|
— | — | — |
36 6 . 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — |