Statement Of Financial Position [Abstract]
| Concept |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Property, plant and equipment | — |
104,000,000
GBP
|
— | — | — |
152,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Goodwill | — |
2,245,000,000
GBP
|
— | — | — |
2,391,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current tax assets | — |
42,000,000
GBP
|
— | — | — |
39,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax assets | — |
56,000,000
GBP
|
— | — | — |
19,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — |
696,000,000
GBP
|
— | — | — |
489,000,000
GBP
|
— | — | — | — |
567,000,000
GBP
|
— | — | — | — |
| Assets | — |
3,936,000,000
GBP
|
— | — | — |
3,897,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital | — |
12,000,000
GBP
|
— | — | — |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Retained earnings | — |
658,000,000
GBP
|
— | — | — |
570,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Share premium | — |
548,000,000
GBP
|
— | — | — |
548,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Other reserves | — |
189,000,000
GBP
|
— | — | — |
267,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity |
658,000,000
GBP
|
1,407,000,000
GBP
|
548,000,000
GBP
|
12,000,000
GBP
|
189,000,000
GBP
|
1,397,000,000
GBP
|
12,000,000
GBP
|
570,000,000
GBP
|
267,000,000
GBP
|
548,000,000
GBP
|
1,111,000,000
GBP
|
448,000,000
GBP
|
103,000,000
GBP
|
12,000,000
GBP
|
548,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||
| Current tax liabilities | — |
25,000,000
GBP
|
— | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — |
18,000,000
GBP
|
— | — | — |
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Liabilities | — |
2,529,000,000
GBP
|
— | — | — |
2,500,000,000
GBP
|
— | — | — | — | — | — | — | — | — |