Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operating activities | — |
10 . 4
GBP
|
— |
98 .5
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Purchase of property, plant and equipment, classified as investing activities | — |
1. 2
GBP
|
— |
0 .8
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
12 .7
GBP
|
— |
8 .6
GBP
|
— |
| Interest received, classified as investing activities | — |
2,300,000
GBP
|
— |
0 .1
GBP
|
— |
| Cash flows from (used in) investing activities | — |
16 2 . 0
GBP
|
— |
3 12 . 5
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
8 .7
GBP
|
— |
—
GBP
|
— |
| Proceeds from borrowings, classified as financing activities | — |
—
GBP
|
— |
208,200,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
5 7. 9
GBP
|
— |
3 3 1. 3
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
7. 3
GBP
|
— |
8 .1
GBP
|
— |
| Cash flows from (used in) financing activities | — |
2 0 1.7
GBP
|
— |
2 9 1. 2
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
5 0 .1
GBP
|
— |
1 19 . 8
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
3,800,000
GBP
|
— |
0 .9
GBP
|
— |
| Cash and cash equivalents |
17 7. 7
GBP
|
— |
2 24 .0
GBP
|
— |
10 3 . 3
GBP
|