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 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 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 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||||||||||||
| Profit (loss) |
56,300,000
GBP
|
— |
47,300,000
GBP
|
–
GBP
|
–
GBP
|
9,000,000
GBP
|
47,300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
76,900,000
GBP
|
20,600,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
96,700,000
GBP
|
88,000,000
GBP
|
8,700,000
GBP
|
–
GBP
|
–
GBP
|
3,300,000
GBP
|
100,000,000
GBP
|
–
GBP
|
88,000,000
GBP
|
–
GBP
|
–
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||||||||||||||
| Adjustments for income tax expense |
22,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
36,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Adjustments for decrease (increase) in inventories |
12,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
25,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Adjustments for provisions |
3,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Adjustments for share-based payments |
2,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other adjustments for non-cash items |
2,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
6,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Adjustments for losses (gains) on disposal of non-current assets |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operations |
126,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
60,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities |
30,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
31,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities |
78,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||||||||||
| Proceeds from sales of property, plant and equipment, classified as investing activities |
1,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities |
60,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
58,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Interest received, classified as investing activities |
3,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities |
60,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
55,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||||||||||
| Proceeds from borrowings, classified as financing activities |
247,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
113,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities |
193,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
39,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities |
8,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
23,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
9,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes |
16,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — |
124,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
117,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
127,300,000
GBP
|