Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
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 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 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||||
| Property, plant and equipment | — |
49,900,000
GBP
|
— | — | — | — | — | — | — |
19,100,000
GBP
|
54,300,000
GBP
|
— | — | — | — | — | — | — |
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Investment property | — |
4,551,400,000
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
5,002,000,000
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — |
4,843,000,000
GBP
|
— | — | — | — | — | — | — |
2,216,400,000
GBP
|
5,294,500,000
GBP
|
— | — | — | — | — | — | — |
2,254,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||
| Trade and other current receivables | — |
42,700,000
GBP
|
— | — | — | — | — | — | — |
2,359,100,000
GBP
|
42,400,000
GBP
|
— | — | — | — | — | — | — |
1,788,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current tax assets, current | — |
400,000
GBP
|
— | — | — | — | — | — | — |
300,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — |
73,000,000
GBP
|
— | — | — | — | — | — | — |
24,800,000
GBP
|
76,600,000
GBP
|
— | — | — | — | — | — | — |
67,300,000
GBP
|
— | — | — | — | — | — | — |
105,500,000
GBP
|
— | — |
90,600,000
GBP
|
| Current assets | — |
185,000,000
GBP
|
— | — | — | — | — | — | — |
2,384,200,000
GBP
|
160,700,000
GBP
|
— | — | — | — | — | — | — |
1,855,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Assets | — |
5,028,000,000
GBP
|
— | — | — | — | — | — | — |
4,600,600,000
GBP
|
5,509,400,000
GBP
|
— | — | — | — | — | — | — |
4,110,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||
| Issued capital | — |
5,600,000
GBP
|
— | — | — | — | — | — | — |
5,600,000
GBP
|
5,600,000
GBP
|
— | — | — | — | — | — | — |
5,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — |
2,367,300,000
GBP
|
— | — | — | — | — | — | — |
304,100,000
GBP
|
2,931,400,000
GBP
|
— | — | — | — | — | — | — |
202,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium | — |
196,600,000
GBP
|
— | — | — | — | — | — | — |
196,600,000
GBP
|
196,600,000
GBP
|
— | — | — | — | — | — | — |
196,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — |
939,300,000
GBP
|
— | — | — | — | — | — | — |
926,200,000
GBP
|
941,900,000
GBP
|
— | — | — | — | — | — | — |
925,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
196,600,000
GBP
|
3,508,800,000
GBP
|
2,367,300,000
GBP
|
939,300,000
GBP
|
196,600,000
GBP
|
304,100,000
GBP
|
5,600,000
GBP
|
926,200,000
GBP
|
5,600,000
GBP
|
1,432,500,000
GBP
|
4,075,500,000
GBP
|
941,900,000
GBP
|
202,200,000
GBP
|
196,600,000
GBP
|
2,931,400,000
GBP
|
5,600,000
GBP
|
196,600,000
GBP
|
925,900,000
GBP
|
1,330,300,000
GBP
|
5,600,000
GBP
|
3,299,700,000
GBP
|
941,100,000
GBP
|
5,600,000
GBP
|
195,400,000
GBP
|
925,600,000
GBP
|
255,700,000
GBP
|
4,441,800,000
GBP
|
195,400,000
GBP
|
5,600,000
GBP
|
1,382,300,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||||||||
| Other non-current provisions | — |
300,000
GBP
|
— | — | — | — | — | — | — |
300,000
GBP
|
200,000
GBP
|
— | — | — | — | — | — | — |
200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — |
1,267,800,000
GBP
|
— | — | — | — | — | — | — |
1,074,200,000
GBP
|
1,264,700,000
GBP
|
— | — | — | — | — | — | — |
1,070,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||||||||
| Other current provisions | — |
100,000
GBP
|
— | — | — | — | — | — | — |
100,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — |
148,000,000
GBP
|
— | — | — | — | — | — | — |
2,009,600,000
GBP
|
148,100,000
GBP
|
— | — | — | — | — | — | — |
1,707,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, current | — |
–
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
900,000
GBP
|
— | — | — | — | — | — | — |
900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — |
251,400,000
GBP
|
— | — | — | — | — | — | — |
2,093,900,000
GBP
|
169,200,000
GBP
|
— | — | — | — | — | — | — |
1,709,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — |
1,519,200,000
GBP
|
— | — | — | — | — | — | — |
3,168,100,000
GBP
|
1,433,900,000
GBP
|
— | — | — | — | — | — | — |
2,779,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |