Statement Of Financial Position [Abstract]
| Concept |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2023-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2022-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
As at 2021-07-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||
| Property, plant and equipment | — |
31,700,000
GBP
|
— | — | — | — | — | — | — |
34,200,000
GBP
|
— | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — |
4,900,000
GBP
|
— | — | — | — | — | — | — |
9,300,000
GBP
|
— | — | — | — | — | — | — | — |
| Current tax assets | — |
8,800,000
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — |
| Deferred tax assets | — |
1,700,000
GBP
|
— | — | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents | — |
362,000,000
GBP
|
— | — | — | — | — | — | — |
375,300,000
GBP
|
— | — | — | — | — | — | — |
460,300,000
GBP
|
| Assets | — |
5,114,100,000
GBP
|
— | — | — | — | — | — | — |
4,985,100,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||
| Issued capital | — |
15,000,000
GBP
|
— | — | — | — | — | — | — |
15,400,000
GBP
|
— | — | — | — | — | — | — | — |
| Retained earnings | — |
3,242,700,000
GBP
|
— | — | — | — | — | — | — |
3,148,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Share premium | — |
182,000,000
GBP
|
— | — | — | — | — | — | — |
182,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Other reserves | — |
1,500,000
GBP
|
— | — | — | — | — | — | — |
1,500,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity |
182,000,000
GBP
|
3,461,600,000
GBP
|
15,000,000
GBP
|
3,242,700,000
GBP
|
20,400,000
GBP
|
1,500,000
GBP
|
182,000,000
GBP
|
15,400,000
GBP
|
3,148,900,000
GBP
|
3,367,800,000
GBP
|
20,000,000
GBP
|
1,500,000
GBP
|
1,500,000
GBP
|
15,400,000
GBP
|
20,000,000
GBP
|
3,071,100,000
GBP
|
179,800,000
GBP
|
3,287,800,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||
| Current tax liabilities | — |
–
GBP
|
— | — | — | — | — | — | — |
100,000
GBP
|
— | — | — | — | — | — | — | — |
| Deferred tax liabilities | — |
6,200,000
GBP
|
— | — | — | — | — | — | — |
8,900,000
GBP
|
— | — | — | — | — | — | — | — |
| Liabilities | — |
1,652,500,000
GBP
|
— | — | — | — | — | — | — |
1,617,300,000
GBP
|
— | — | — | — | — | — | — | — |