Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
17,300,000
GBP
|
13,800,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
27,900,000
GBP
|
25,200,000
GBP
|
— |
| Goodwill |
24,200,000
GBP
|
22,900,000
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 |
212,200,000
GBP
|
150,200,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
2,100,000
GBP
|
4,900,000
GBP
|
— |
| Trade and other current receivables [abstract] | |||
| Other current receivables |
16,200,000
GBP
|
14,000,000
GBP
|
— |
| Trade and other current receivables |
656,600,000
GBP
|
566,600,000
GBP
|
— |
| Cash and cash equivalents [abstract] | |||
| Cash [abstract] | |||
| Cash |
50,700,000
GBP
|
41,700,000
GBP
|
— |
| Cash and cash equivalents |
50,700,000
GBP
|
41,700,000
GBP
|
116,300,000
GBP
|
| Miscellaneous current assets [abstract] | |||
| Current derivative financial assets |
4,500,000
GBP
|
700,000
GBP
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
477,000,000
GBP
|
468,500,000
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
71,800,000
GBP
|
3,100,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
122,200,000
GBP
|
112,800,000
GBP
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current derivative financial liabilities |
4,600,000
GBP
|
7,600,000
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
23,400,000
GBP
|
23,400,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
476,000,000
GBP
|
441,500,000
GBP
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
9,200,000
GBP
|
32,600,000
GBP
|
— |
| Reserve of cash flow hedges |
100,000
GBP
|
1,600,000
GBP
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
2,300,000
GBP
|
2,300,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
1,171,100,000
GBP
|
999,300,000
GBP
|
— |
| Liabilities |
725 .9
GBP
|
632,200,000
GBP
|
— |
| Assets (liabilities) |
445,200,000
GBP
|
367,100,000
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
729,600,000
GBP
|
624,600,000
GBP
|
— |
| Current liabilities |
228,800,000
GBP
|
143,500,000
GBP
|
— |
| Assets less current liabilities [abstract] |