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 |
344,900,000
GBP
|
293,800,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
3,000,000
GBP
|
4,700,000
GBP
|
| Goodwill |
176,900,000
GBP
|
177,500,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Trade and other non-current receivables |
3,600,000
GBP
|
3,400,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
13,000,000
GBP
|
13,500,000
GBP
|
| Non-current investments other than investments accounted for using equity method |
2,000,000
GBP
|
2,200,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
189,600,000
GBP
|
191,600,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
165,900,000
GBP
|
175,100,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
120,800,000
GBP
|
124,500,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
1,200,000
GBP
|
1,500,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
337,700,000
GBP
|
309,100,000
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
9,300,000
GBP
|
600,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
2,800,000
GBP
|
2,400,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
204,100,000
GBP
|
192,000,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
2,600,000
GBP
|
500,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
70,900,000
GBP
|
71,300,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
179,300,000
GBP
|
170,800,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
1,077,100,000
GBP
|
1,038,200,000
GBP
|
| Liabilities |
687,800,000
GBP
|
639,600,000
GBP
|
| Assets (liabilities) |
389,300,000
GBP
|
398,600,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
479,800,000
GBP
|
493,900,000
GBP
|
| Current liabilities |
263,100,000
GBP
|
239,500,000
GBP
|
| Assets less current liabilities [abstract] |