Statement Of Financial Position [Abstract]
| Concept |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Property, plant and equipment |
89,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
103,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets |
–
GBP
|
— | — | — | — | — | — | — | — | — |
10,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
18,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
9,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
297,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
372,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
351,700,000
GBP
|
— |
| Assets |
8,938,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
8,359,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital |
300,000
GBP
|
— | — | — | — | — | — | — | — | — |
300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
1,114,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,348,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
13,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
13,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
173,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
44,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
954,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,406,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
1,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
955,400,000
GBP
|
1,200,000
GBP
|
13,100,000
GBP
|
1,114,500,000
GBP
|
300,000
GBP
|
11,100,000
GBP
|
954,200,000
GBP
|
205,900,000
GBP
|
21,100,000
GBP
|
1,348,800,000
GBP
|
1,408,500,000
GBP
|
3,000,000
GBP
|
36,700,000
GBP
|
1,406,200,000
GBP
|
13,100,000
GBP
|
2,300,000
GBP
|
4,300,000
GBP
|
300,000
GBP
|
1,004,400,000
GBP
|
10,700,000
GBP
|
3,600,000
GBP
|
1,112,700,000
GBP
|
300,000
GBP
|
13,100,000
GBP
|
13,100,000
GBP
|
1,123,400,000
GBP
|
85,400,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Trade and other payables |
2,158,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,960,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Insurance contracts issued that are liabilities |
4,792,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
4,215,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities |
5,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
7,983,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
6,951,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
8,938,500,000
GBP
|
— | — | — | — | — | — | — | — | — |
8,359,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |