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 |
183,700,000
GBP
|
176,400,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
580,200,000
GBP
|
596,800,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Trade and other current receivables |
81,800,000
GBP
|
73,900,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
73,500,000
GBP
|
69,200,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
43,600,000
GBP
|
17,000,000
GBP
|
50,000,000
GBP
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale |
–
GBP
|
17,100,000
GBP
|
— |
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
–
GBP
|
100,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
145,200,000
GBP
|
142,900,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
128,200,000
GBP
|
114,800,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
200,000
GBP
|
200,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
431,900,000
GBP
|
425,200,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
200,000
GBP
|
100,000
GBP
|
— |
| Reserve of cash flow hedges |
100,000
GBP
|
100,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
1,100,000
GBP
|
1,100,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
993,000,000
GBP
|
978,800,000
GBP
|
— |
| Liabilities |
350,000,000
GBP
|
342,200,000
GBP
|
— |
| Assets (liabilities) |
643,000,000
GBP
|
636,600,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
202,100,000
GBP
|
182,700,000
GBP
|
— |
| Current liabilities |
135,600,000
GBP
|
130,800,000
GBP
|
— |
| Assets less current liabilities [abstract] |