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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Investment property |
4,847,300,000
GBP
|
— | — | — | — |
5,249,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
2,000,000
GBP
|
— | — | — | — |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current assets |
5,057,500,000
GBP
|
— | — | — | — |
5,485,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Trade and other current receivables |
24,900,000
GBP
|
— | — | — | — |
37,100,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
47,400,000
GBP
|
— | — | — | — |
70,900,000
GBP
|
— | — | — | — |
57,600,000
GBP
|
— | — | — | — |
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners |
25,100,000
GBP
|
— | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — |
| Current assets |
97,600,000
GBP
|
— | — | — | — |
108,200,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Assets |
5,155,100,000
GBP
|
— | — | — | — |
5,593,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital |
18,700,000
GBP
|
— | — | — | — |
18,700,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Retained earnings |
1,731,900,000
GBP
|
— | — | — | — |
2,331,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Share premium |
764,300,000
GBP
|
— | — | — | — |
762,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity |
3,350,000,000
GBP
|
764,300,000
GBP
|
835,100,000
GBP
|
1,731,900,000
GBP
|
18,700,000
GBP
|
4,076,500,000
GBP
|
2,331,300,000
GBP
|
964,500,000
GBP
|
762,000,000
GBP
|
18,700,000
GBP
|
2,921,300,000
GBP
|
1,358,700,000
GBP
|
17,200,000
GBP
|
1,078,900,000
GBP
|
466,500,000
GBP
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Trade and other non-current payables |
2,000,000
GBP
|
— | — | — | — |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current liabilities |
1,658,100,000
GBP
|
— | — | — | — |
1,388,600,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Trade and other current payables |
111,200,000
GBP
|
— | — | — | — |
85,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities |
147,000,000
GBP
|
— | — | — | — |
128,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Liabilities |
1,805,100,000
GBP
|
— | — | — | — |
1,517,400,000
GBP
|
— | — | — | — | — | — | — | — | — |