Statement Of Cash Flows [Abstract]
| Concept |
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 |
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 |
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 |
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) |
66,100,000
GBP
|
–
GBP
|
— |
2,900,000
GBP
|
69,000,000
GBP
|
2,900,000
GBP
|
69,000,000
GBP
|
–
GBP
|
2,900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
69,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
577 .2
GBP
|
1 4.3
GBP
|
–
GBP
|
–
GBP
|
14,300,000
GBP
|
562,900,000
GBP
|
14,300,000
GBP
|
562,900,000
GBP
|
562,900,000
GBP
|
–
GBP
|
— |
| Cash flows from (used in) operations |
328,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
57 .7
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Interest paid, classified as operating activities |
34,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
25,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities |
294,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
32,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||||||||
| Proceeds from borrowings, classified as financing activities |
61 8.6
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
555,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities |
699,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
591 .6
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Dividends paid, classified as financing activities |
56,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
57 .6
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities |
310 .9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 45.2
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
17 .0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 12.6
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
3,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — |
204,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
21 8.0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
325,900,000
GBP
|