Statement Of Cash Flows [Abstract]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operating activities | — |
1 0 0 .1
GBP
|
— |
3 3 .1
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Purchase of property, plant and equipment, classified as investing activities | — |
0. 8
GBP
|
— |
0 .8
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
8 .6
GBP
|
— |
9,500,000
GBP
|
— |
| Interest received, classified as investing activities | — |
0 .1
GBP
|
— |
400,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
3 10.9
GBP
|
— |
2 2.2
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Proceeds from borrowings, classified as financing activities | — |
208,200,000
GBP
|
— |
2 3 0 .1
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
3 3 1. 3
GBP
|
— |
2 9 9 .1
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
8 .1
GBP
|
— |
7. 8
GBP
|
— |
| Cash flows from (used in) financing activities | — |
2 91. 2
GBP
|
— |
116 . 2
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
11 9 . 8
GBP
|
— |
6 0 .9
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
900,000
GBP
|
— |
0 . 3
GBP
|
— |
| Cash and cash equivalents |
224 .0
GBP
|
— |
10 3 . 3
GBP
|
— |
16 4 .5
GBP
|