Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
16 . 4
GBP
|
2 1. 9
GBP
|
29 .7
GBP
|
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
3 15 . 2
GBP
|
3 8 1. 6
GBP
|
44 5.2
GBP
|
| Goodwill |
3 91. 2
GBP
|
6 9 1. 3
GBP
|
71 8.8
GBP
|
| Trade and other non-current receivables [abstract] | |||
| Other non-current receivables |
9. 2
GBP
|
13 . 7
GBP
|
12 . 2
GBP
|
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
450,800,000
GBP
|
4 0 7. 5
GBP
|
4 42. 4
GBP
|
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
16 8 . 4
GBP
|
14 5 . 7
GBP
|
223,600,000
GBP
|
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
3 0 7. 2
GBP
|
3 20.9
GBP
|
3 26 . 2
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
0 . 2
GBP
|
0 . 2
GBP
|
0 .7
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
4 8 2 .0
GBP
|
4 1 8 .1
GBP
|
4 4 3 . 2
GBP
|
| Issued capital [abstract] | |||
| Issued capital |
15 4 . 9
GBP
|
14 5 . 9
GBP
|
14 2 . 0
GBP
|
| Retained earnings [abstract] | |||
| Retained earnings |
209 .8
GBP
|
50 8.9
GBP
|
513 . 5
GBP
|
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
2 2 . 9
GBP
|
6 .1
GBP
|
48,500,000
GBP
|
| Net assets (liabilities) [abstract] | |||
| Assets |
1, 4 4 5 . 3
GBP
|
1, 7 3 7. 3
GBP
|
1, 9 4 2 . 5
GBP
|
| Liabilities |
8 6 7. 8
GBP
|
8 45 . 4
GBP
|
1, 0 5 7. 3
GBP
|
| Assets (liabilities) |
5 7 7. 5
GBP
|
8 91.9
GBP
|
8 8 5. 2
GBP
|
| Net current assets (liabilities) [abstract] | |||
| Current assets |
628,800,000
GBP
|
558. 1
GBP
|
666. 0
GBP
|
| Current liabilities |
50 4 .0
GBP
|
454. 6
GBP
|
6 42 .5
GBP
|
| Assets less current liabilities [abstract] |