Statement Of Financial Position [Abstract]
| Concept |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||
| Property, plant and equipment | — | — | — |
2,900,000
GBP
|
— | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Investment property | — | — | — |
2,366,700,000
GBP
|
— | — | — | — | — |
2,349,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — |
300,000
GBP
|
— | — | — | — | — |
0. 4
GBP
|
— | — | — | — | — | — | — | — |
| Non-current assets | — | — | — |
2,37 3.5
GBP
|
— | — | — | — | — |
2,373,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||
| Trade and other current receivables | — | — | — |
23,500,000
GBP
|
— | — | — | — | — |
29,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — |
49,000,000
GBP
|
— | — | — | — | — |
191,000,000
GBP
|
— | — | — |
79,200,000
GBP
|
— | — | — | — |
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners | — | — | — |
65,900,000
GBP
|
— | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
| Current assets | — | — | — |
138,400,000
GBP
|
— | — | — | — | — |
220,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Assets | — | — | — |
2,511,900,000
GBP
|
— | — | — | — | — |
2,593,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital | — | — | — |
181. 1
GBP
|
— | — | — | — | — |
181. 1
GBP
|
— | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
1,300,300,000
GBP
|
— | — | — | — | — |
1,219,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Share premium | — | — | — |
295,500,000
GBP
|
— | — | — | — | — |
295,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Treasury shares | — | — | — |
9,900,000
GBP
|
— | — | — | — | — |
9,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Other reserves | — | — | — |
32,600,000
GBP
|
— | — | — | — | — |
33. 1
GBP
|
— | — | — | — | — | — | — | — |
| Equity |
181,100,000
GBP
|
295,500,000
GBP
|
1,300,300,000
GBP
|
1,7 99.6
GBP
|
32,600,000
GBP
|
9,900,000
GBP
|
9,600,000
GBP
|
1,219,400,000
GBP
|
33. 1
GBP
|
1,719,500,000
GBP
|
181,100,000
GBP
|
295,500,000
GBP
|
32,200,000
GBP
|
1,998,000,000
GBP
|
1 80.7
GBP
|
295,400,000
GBP
|
9,600,000
GBP
|
1,499,300,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||
| Non-current liabilities | — | — | — |
626,500,000
GBP
|
— | — | — | — | — |
622,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||
| Trade and other current payables | — | — | — |
85,800,000
GBP
|
— | — | — | — | — |
95. 0
GBP
|
— | — | — | — | — | — | — | — |
| Current liabilities | — | — | — |
85,800,000
GBP
|
— | — | — | — | — |
251,600,000
GBP
|
— | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
712,300,000
GBP
|
— | — | — | — | — |
87 4.1
GBP
|
— | — | — | — | — | — | — | — |