Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-12-31 |
As at 2023-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
2 9 2 .1
GBP
|
284,700,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
3 2 .1
GBP
|
3 3 .1
GBP
|
| Goodwill |
19 5 .4
GBP
|
19 3 . 3
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
3,300,000
GBP
|
5 .1
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Trade and other non-current receivables |
400,000
GBP
|
0. 8
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
43. 5
GBP
|
4 8.5
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
1 3 7. 2
GBP
|
141,700,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
2 36 .0
GBP
|
2 0 7. 5
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
4 5.5
GBP
|
4 7. 6
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
12 3 . 9
GBP
|
1 77 .8
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
75 .0
GBP
|
1. 8
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
196 . 9
GBP
|
18 8 . 4
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
6,800,000
GBP
|
8,000,000
GBP
|
| Other non-current liabilities |
8,500,000
GBP
|
8 .9
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
41 . 9
GBP
|
4 1 .9
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
37 6 .7
GBP
|
3 6 8.0
GBP
|
| Miscellaneous equity [abstract] | ||
| Reserve of share-based payments |
7. 8
GBP
|
7 .9
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
1, 01 5. 8
GBP
|
98 5.3
GBP
|
| Liabilities |
54 5.9
GBP
|
528 .2
GBP
|
| Assets (liabilities) |
46 9. 9
GBP
|
4 5 7.1
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
4 2 1. 5
GBP
|
3 9 9 .1
GBP
|
| Current liabilities |
3 1 7. 8
GBP
|
233,600,000
GBP
|
| Assets less current liabilities [abstract] |