Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 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] | |||||
| Cash flows from (used in) operating activities |
2 5.6
GBP
|
— | — |
8 .1
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Purchase of property, plant and equipment, classified as investing activities |
700,000
GBP
|
— | — |
1 .2
GBP
|
— |
| Purchase of intangible assets, classified as investing activities |
11,500,000
GBP
|
— | — |
12,700,000
GBP
|
— |
| Cash flows from (used in) investing activities |
66,400,000
GBP
|
— | — |
159,700,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares |
1. 8
GBP
|
— | — |
8 .7
GBP
|
— |
| Proceeds from borrowings, classified as financing activities |
55,800,000
GBP
|
— | — |
—
GBP
|
— |
| Repayments of borrowings, classified as financing activities |
2 0.9
GBP
|
— | — |
5 7. 9
GBP
|
— |
| Payments of lease liabilities, classified as financing activities |
7. 2
GBP
|
— | — |
7. 3
GBP
|
— |
| Cash flows from (used in) financing activities |
3,700,000
GBP
|
— | — |
201,700,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
44,500,000
GBP
|
— | — |
5 0 .1
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents |
800,000
GBP
|
— | — |
3,800,000
GBP
|
— |
| Cash and cash equivalents | — |
2 21.4
GBP
|
1 7 7. 7
GBP
|
— |
2 24. 0
GBP
|