Statement Of Financial Position [Abstract]
| Concept |
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 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment |
25,500,000
GBP
|
— | — | — | — | — |
22,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
39,300,000
GBP
|
— | — | — | — | — |
45. 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investment property |
1,000,000
GBP
|
— | — | — | — | — |
1,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
2,600,000
GBP
|
— | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
14,600,000
GBP
|
— | — | — | — | — |
10,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
288,900,000
GBP
|
— | — | — | — | — |
290,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Trade and other current receivables |
150. 1
GBP
|
— | — | — | — | — |
117 .4
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
384,400,000
GBP
|
— | — | — | — | — |
261,600,000
GBP
|
— | — | — | — | — |
173,400,000
GBP
|
— | — | — | — | — |
| Current assets |
543,400,000
GBP
|
— | — | — | — | — |
391,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital |
7. 7
GBP
|
— | — | — | — | — |
7. 6
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
287 .2
GBP
|
— | — | — | — | — |
245,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
114,800,000
GBP
|
— | — | — | — | — |
104,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
409,700,000
GBP
|
— | — | — | — | — |
356,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
3,500,000
GBP
|
— | — | — | — | — |
4 .7
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
413,200,000
GBP
|
3,500,000
GBP
|
287 .2
GBP
|
7. 7
GBP
|
409,700,000
GBP
|
114,800,000
GBP
|
361,600,000
GBP
|
245,300,000
GBP
|
104,000,000
GBP
|
356,900,000
GBP
|
4,700,000
GBP
|
7. 6
GBP
|
328,400,000
GBP
|
7. 6
GBP
|
211,900,000
GBP
|
4,300,000
GBP
|
104,600,000
GBP
|
32 4. 1
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||
| Non-current provisions |
1,900,000
GBP
|
— | — | — | — | — |
1,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables |
5,800,000
GBP
|
— | — | — | — | — |
2,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
7 .1
GBP
|
— | — | — | — | — |
11,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
52,900,000
GBP
|
— | — | — | — | — |
63,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||
| Current provisions |
600,000
GBP
|
— | — | — | — | — |
0 .6
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
335,900,000
GBP
|
— | — | — | — | — |
235,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
366,200,000
GBP
|
— | — | — | — | — |
257 .3
GBP
|
— | — | — | — | — | — | — | — | — | — | — |