Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-01-01 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||
| Profit (loss) |
223,400,000
GBP
|
— |
223,400,000
GBP
|
223,400,000
GBP
|
— | — |
204,300,000
GBP
|
204,300,000
GBP
|
204,300,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||
| Adjustments for decrease (increase) in inventories |
286,100,000
GBP
|
— | — | — | — | — | — |
83,700,000
GBP
|
— | — |
| Adjustments for decrease (increase) in trade accounts receivable |
83,300,000
GBP
|
— | — | — | — | — | — |
86,000,000
GBP
|
— | — |
| Adjustments for increase (decrease) in trade accounts payable |
1,800,000
GBP
|
— | — | — | — | — | — |
7 1.6
GBP
|
— | — |
| Adjustments for depreciation and amortisation expense |
7 4.1
GBP
|
— | — | — | — | — | — |
35,300,000
GBP
|
— | — |
| Adjustments for provisions |
15,900,000
GBP
|
— | — | — | — | — | — |
2,800,000
GBP
|
— | — |
| Adjustments for share-based payments |
8,000,000
GBP
|
— | — | — | — | — | — |
6,300,000
GBP
|
— | — |
| Other adjustments for non-cash items |
1,900,000
GBP
|
— | — | — | — | — | — |
9,500,000
GBP
|
— | — |
| Cash flows from (used in) operations |
34,400,000
GBP
|
— | — | — | — | — | — |
136,200,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities |
37,700,000
GBP
|
— | — | — | — | — | — |
65,300,000
GBP
|
— | — |
| Cash flows from (used in) operating activities |
72,100,000
GBP
|
— | — | — | — | — | — |
70,900,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |
-
GBP
|
— | — | — | — | — | — |
7 7.7
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities |
2,800,000
GBP
|
— | — | — | — | — | — |
1,600,000
GBP
|
— | — |
| Cash advances and loans made to other parties, classified as investing activities |
195,400,000
GBP
|
— | — | — | — | — | — |
139,500,000
GBP
|
— | — |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities |
197,800,000
GBP
|
— | — | — | — | — | — |
188,500,000
GBP
|
— | — |
| Dividends received, classified as investing activities |
42,300,000
GBP
|
— | — | — | — | — | — |
38,100,000
GBP
|
— | — |
| Interest received, classified as investing activities |
4,200,000
GBP
|
— | — | — | — | — | — |
900,000
GBP
|
— | — |
| Cash flows from (used in) investing activities |
52,500,000
GBP
|
— | — | — | — | — | — |
19,300,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||
| Proceeds from issuing shares |
1,600,000
GBP
|
— | — | — | — | — | — |
300,000
GBP
|
— | — |
| Payments to acquire or redeem entity's shares |
5,300,000
GBP
|
— | — | — | — | — | — |
35,200,000
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities |
50,500,000
GBP
|
— | — | — | — | — | — |
396,400,000
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities |
23,900,000
GBP
|
— | — | — | — | — | — |
16,100,000
GBP
|
— | — |
| Dividends paid, classified as financing activities |
110,400,000
GBP
|
— | — | — | — | — | — |
138,900,000
GBP
|
— | — |
| Interest paid, classified as financing activities |
44,900,000
GBP
|
— | — | — | — | — | — |
16,600,000
GBP
|
— | — |
| Cash flows from (used in) financing activities |
238,900,000
GBP
|
— | — | — | — | — | — |
187,900,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes |
25 8.5
GBP
|
— | — | — | — | — | — |
278,100,000
GBP
|
— | — |
| Cash and cash equivalents | — |
4 18.3
GBP
|
— | — |
67 6.8
GBP
|
67 6.8
GBP
|
— | — | — |
398,700,000
GBP
|