Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
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 0 .7
GBP
|
15 0.5
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
18 4 .1
GBP
|
169 .1
GBP
|
| Goodwill |
6 0 6.1
GBP
|
631. 5
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments in associates accounted for using equity method |
2 .9
GBP
|
–
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Other non-current receivables |
4,200,000
GBP
|
–
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current derivative financial assets |
400,000
GBP
|
–
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
362. 5
GBP
|
315,900,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
263 . 3
GBP
|
1 8 7. 9
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
228 .1
GBP
|
1 6 7. 8
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 or as held for distribution to owners |
1 .7
GBP
|
10,400,000
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
1. 3
GBP
|
0. 3
GBP
|
| Miscellaneous assets [abstract] | ||
| Equity instruments held |
29. 3
GBP
|
24 . 3
GBP
|
| Debt instruments held [abstract] | ||
| Debt instruments held |
18,900,000
GBP
|
2 3.0
GBP
|
| Borrowings [abstract] | ||
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
100,000
GBP
|
–
GBP
|
| Trade and other non-current payables [abstract] | ||
| Other non-current payables |
13 .8
GBP
|
13. 8
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
37 3 .7
GBP
|
33 0. 2
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
8 .9
GBP
|
2 2. 3
GBP
|
| Non-current derivative financial liabilities |
0. 2
GBP
|
–
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
2 . 3
GBP
|
1. 2
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
5,500,000
GBP
|
5,800,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
1,113,000,000
GBP
|
9 5 7. 6
GBP
|
| Accumulated other comprehensive income [abstract] | ||
| Reserve of exchange differences on translation |
8 6.0
GBP
|
66. 2
GBP
|
| Reserve of cash flow hedges |
3 .1
GBP
|
3 . 5
GBP
|
| Miscellaneous equity [abstract] | ||
| Capital redemption reserve |
1,000,000
GBP
|
0 .7
GBP
|
| Merger reserve |
3 .1
GBP
|
3,100,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
1,948,000,000
GBP
|
1 ,76 8 .1
GBP
|
| Liabilities |
5 11.1
GBP
|
50 6. 8
GBP
|
| Assets (liabilities) |
1,436,900,000
GBP
|
1 ,26 1. 3
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
865. 5
GBP
|
688,000,000
GBP
|
| Current liabilities |
41 8 .0
GBP
|
3 93 .7
GBP
|
| Current assets (liabilities) |
4 4 7. 5
GBP
|
294. 3
GBP
|
| Assets less current liabilities [abstract] |