Statement Of Financial Position [Abstract]
| Concept |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-05-01 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2020-05-01 |
As at 2020-05-01 |
As at 2020-05-01 |
As at 2020-05-01 |
As at 2020-05-01 |
As at 2020-05-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — |
40,500,000
GBP
|
— | — | — | — | — | — | — | — |
46,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — |
5,800,000
GBP
|
— | — | — | — | — | — | — | — |
3,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — |
120,700,000
GBP
|
— | — | — | — | — | — | — | — |
4 0 .1
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — |
37 4.6
GBP
|
— | — | — | — | — | — | — | — |
388,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||
| Cash and cash equivalents | — | — | — | — |
928,900,000
GBP
|
— | — | — | — | — |
1,428,000
GBP
|
— | — |
1,428,200,000
GBP
|
— | — | — | — | — |
1,638,900,000
GBP
|
— | — | — | — |
| Current assets | — | — | — | — |
6,213. 1
GBP
|
— | — | — | — | — | — | — | — |
5, 164.0
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — |
6,587 .7
GBP
|
— | — | — | — | — | — | — | — |
5,552,200,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Issued capital | — | — | — | — |
6,500,000
GBP
|
— | — | — | — | — | — | — | — |
6,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — |
4,016. 1
GBP
|
— | — | — | — | — | — | — | — |
4, 055.4
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — |
49,800,000
GBP
|
— | — | — | — | — | — | — | — |
49,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — |
961,300,000
GBP
|
— | — | — | — | — | — | — | — |
961,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Equity |
4,016. 1
GBP
|
49,800,000
GBP
|
6,500,000
GBP
|
25,000,000
GBP
|
3, 136. 1
GBP
|
961,300,000
GBP
|
49,800,000
GBP
|
24,900,000
GBP
|
6,600,000
GBP
|
961,300,000
GBP
|
3, 175.4
GBP
|
4,055,400,000
GBP
|
961,300,000
GBP
|
3, 175.4
GBP
|
49,800,000
GBP
|
4,055,400,000
GBP
|
6,600,000
GBP
|
2 4.9
GBP
|
3,981,600,000
GBP
|
3, 101.6
GBP
|
961,300,000
GBP
|
6,800,000
GBP
|
24. 7
GBP
|
49,800,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||
| Non-current provisions | — | — | — | — |
98,500,000
GBP
|
— | — | — | — | — | — | — | — |
62,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables | — | — | — | — |
719,800,000
GBP
|
— | — | — | — | — | — | — | — |
330,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — |
1,482. 1
GBP
|
— | — | — | — | — | — | — | — |
694,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||
| Current provisions | — | — | — | — |
62,500,000
GBP
|
— | — | — | — | — | — | — | — |
65,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — | — | — | — |
1,904,900,000
GBP
|
— | — | — | — | — | — | — | — |
1,614. 7
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — |
1,969,500,000
GBP
|
— | — | — | — | — | — | — | — |
1,682,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — |
3,451,600,000
GBP
|
— | — | — | — | — | — | — | — |
2,37 6.8
GBP
|
— | — | — | — | — | — | — | — | — | — |