Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
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 |
86,000,000
GBP
|
74,800,000
GBP
|
| Investment property [abstract] | ||
| Investment property |
800,000
GBP
|
800,000
GBP
|
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||
| Investments in joint ventures reported in separate financial statements |
106,600,000
GBP
|
84,000,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
461,600,000
GBP
|
353,000,000
GBP
|
| Current prepayments and current accrued income including current contract assets [abstract] | ||
| Current accrued income including current contract assets [abstract] | ||
| Current contract assets |
270,600,000
GBP
|
294,600,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
344,700,000
GBP
|
333,900,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
541,300,000
GBP
|
431,700,000
GBP
|
| Borrowings [abstract] | ||
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
80,600,000
GBP
|
77,100,000
GBP
|
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
28,200,000
GBP
|
37,300,000
GBP
|
| Trade and other current payables [abstract] | ||
| Current accruals and current deferred income including current contract liabilities [abstract] | ||
| Current deferred income including current contract liabilities [abstract] | ||
| Current contract liabilities [abstract] | ||
| Current contract liabilities |
95,800,000
GBP
|
74,200,000
GBP
|
| Trade and other current payables |
1,087,000,000
GBP
|
963,200,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
–
GBP
|
200,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
2,400,000
GBP
|
2,400,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
508,400,000
GBP
|
436,800,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
2,030,200,000
GBP
|
1,794,400,000
GBP
|
| Liabilities |
1,462,100,000
GBP
|
1,298,200,000
GBP
|
| Assets (liabilities) |
568,100,000
GBP
|
496,200,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
1,618,200,000
GBP
|
1,413,600,000
GBP
|
| Current liabilities |
1,361,100,000
GBP
|
1,191,200,000
GBP
|
| Current assets (liabilities) |
257,100,000
GBP
|
222,400,000
GBP
|
| Assets less current liabilities [abstract] |