Statement Of Cash Flows [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations |
97,300,000
GBP
|
— |
104,600,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities |
8,800,000
GBP
|
— |
10,400,000
GBP
|
— | — |
| Cash flows from (used in) operating activities |
76,800,000
GBP
|
— |
77,700,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities |
—
GBP
|
— |
1,400,000
GBP
|
— | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |
2,600,000
GBP
|
— |
3,000,000
GBP
|
— | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities |
4,400,000
GBP
|
— |
6,900,000
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities |
9,200,000
GBP
|
— |
18,300,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities |
2,400,000
GBP
|
— |
2,500,000
GBP
|
— | — |
| Interest received, classified as investing activities |
—
GBP
|
— |
100,000
GBP
|
— | — |
| Cash flows from (used in) investing activities |
9,800,000
GBP
|
— |
18,200,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares |
1,400,000
GBP
|
— |
300,000
GBP
|
— | — |
| Proceeds from borrowings, classified as financing activities |
25,000,000
GBP
|
— |
44,800,000
GBP
|
— | — |
| Repayments of borrowings, classified as financing activities |
80,000,000
GBP
|
— |
84,400,000
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities |
5,300,000
GBP
|
— |
9,600,000
GBP
|
— | — |
| Dividends paid, classified as financing activities |
21,000,000
GBP
|
— |
31,600,000
GBP
|
— | — |
| Cash flows from (used in) financing activities |
82,700,000
GBP
|
— |
81,100,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
15,700,000
GBP
|
— |
21,600,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents |
100,000
GBP
|
— |
200,000
GBP
|
— | — |
| Cash and cash equivalents | — |
18,900,000
GBP
|
— |
34,500,000
GBP
|
56,300,000
GBP
|