Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
16,000,000
GBP
|
17,300,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
32,300,000
GBP
|
27,900,000
GBP
|
— |
| Goodwill |
23,600,000
GBP
|
24,200,000
GBP
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in subsidiaries reported in separate financial statements |
–
GBP
|
–
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
203,300,000
GBP
|
212,200,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
6 .1
GBP
|
2,100,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Other current receivables |
16,000,000
GBP
|
16,200,000
GBP
|
— |
| Trade and other current receivables |
689,600,000
GBP
|
656,600,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash [abstract] | |||
| Cash |
42,500,000
GBP
|
50,700,000
GBP
|
— |
| Cash and cash equivalents |
42,500,000
GBP
|
50,700,000
GBP
|
41,700,000
GBP
|
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
2. 9
GBP
|
4,500,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
459,600,000
GBP
|
477,000,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
52,200,000
GBP
|
71,800,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
132,900,000
GBP
|
122,200,000
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
4,400,000
GBP
|
4,600,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
23,400,000
GBP
|
23,400,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
503,200,000
GBP
|
476,000,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
32,000,000
GBP
|
9,200,000
GBP
|
— |
| Reserve of cash flow hedges |
200,000
GBP
|
100,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
2,300,000
GBP
|
2,300,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
1,189,000,000
GBP
|
1,171,100,000
GBP
|
— |
| Liabilities |
687,100,000
GBP
|
725,900,000
GBP
|
— |
| Assets (liabilities) |
501,900,000
GBP
|
445,200,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
754,300,000
GBP
|
729,600,000
GBP
|
— |
| Current liabilities |
205,100,000
GBP
|
228,800,000
GBP
|
— |
| Assets less current liabilities [abstract] |