Statement Of Cash Flows [Abstract]
| Concept |
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 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 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
–
GBP
|
12,800,000
GBP
|
— |
–
GBP
|
12,800,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
58,800,000
GBP
|
–
GBP
|
–
GBP
|
58,800,000
GBP
|
— |
| Cash flows from (used in) operations | — | — | — |
11,200,000
GBP
|
— | — | — | — | — | — | — | — |
89,000,000
GBP
|
— | — | — | — |
| Interest paid, classified as operating activities | — | — | — |
6,100,000
GBP
|
— | — | — | — | — | — | — | — |
2,400,000
GBP
|
— | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — |
2,700,000
GBP
|
— | — | — | — | — | — | — | — |
11,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) operating activities | — | — | — |
20,000,000
GBP
|
— | — | — | — | — | — | — | — |
75,600,000
GBP
|
— | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — |
400,000
GBP
|
— | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
33,000,000
GBP
|
— | — | — | — | — | — | — | — |
42,100,000
GBP
|
— | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — |
1,100,000
GBP
|
— | — | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) investing activities | — | — | — |
33,800,000
GBP
|
— | — | — | — | — | — | — | — |
41,200,000
GBP
|
— | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||
| Payments to acquire or redeem entity's shares | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
40,300,000
GBP
|
— | — | — | — |
| Proceeds from borrowings, classified as financing activities | — | — | — |
137,000,000
GBP
|
— | — | — | — | — | — | — | — |
40,000,000
GBP
|
— | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — |
67,000,000
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — |
5,900,000
GBP
|
— | — | — | — | — | — | — | — |
5,300,000
GBP
|
— | — | — | — |
| Dividends paid, classified as financing activities | — | — | — |
25,700,000
GBP
|
— | — | — | — | — | — | — | — |
24,200,000
GBP
|
— | — | — | — |
| Cash flows from (used in) financing activities | — | — | — |
35,500,000
GBP
|
— | — | — | — | — | — | — | — |
41,600,000
GBP
|
— | — | — | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — | — |
18,300,000
GBP
|
— | — | — | — | — | — | — | — |
7,200,000
GBP
|
— | — | — | — |
| Cash and cash equivalents | — | — | — | — |
16,000,000
GBP
|
— | — | — |
34,300,000
GBP
|
— | — | — | — | — | — | — |
41,500,000
GBP
|