Statement Of Financial Position [Abstract]
| Concept |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Property, plant and equipment |
108,000,000
GBP
|
— | — | — | — |
104,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Goodwill |
2,130,000,000
GBP
|
— | — | — | — |
2,245,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
137,000,000
GBP
|
— | — | — | — |
138,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax assets |
81,000,000
GBP
|
— | — | — | — |
56,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current assets |
2,710,000,000
GBP
|
— | — | — | — |
2,822,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Trade and other current receivables |
404,000,000
GBP
|
— | — | — | — |
37 6
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
508,000,000
GBP
|
— | — | — | — |
696,000,000
GBP
|
— | — | — | — |
489,000,000
GBP
|
— | — | — | — |
| Current assets |
928,000,000
GBP
|
— | — | — | — |
1,114,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Assets |
3,638,000,000
GBP
|
— | — | — | — |
3,936,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital |
11,000,000
GBP
|
— | — | — | — |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Retained earnings |
446,000,000
GBP
|
— | — | — | — |
658,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Share premium |
548,000,000
GBP
|
— | — | — | — |
548,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Other reserves |
88,000,000
GBP
|
— | — | — | — |
189,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Equity |
1,093,000,000
GBP
|
11,000,000
GBP
|
548,000,000
GBP
|
446,000,000
GBP
|
88,000,000
GBP
|
1,407,000,000
GBP
|
658,000,000
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
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||
| Non-current provisions |
25,000,000
GBP
|
— | — | — | — |
24,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Trade and other non-current payables |
3,000,000
GBP
|
— | — | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
18,000,000
GBP
|
— | — | — | — |
18,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Non-current liabilities |
1,319,000,000
GBP
|
— | — | — | — |
1,344,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Current provisions [abstract] | |||||||||||||||
| Current provisions |
22,000,000
GBP
|
— | — | — | — |
23,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Trade and other current payables |
405,000,000
GBP
|
— | — | — | — |
378,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Current liabilities |
1,226,000,000
GBP
|
— | — | — | — |
1,185,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Liabilities |
2,545,000,000
GBP
|
— | — | — | — |
2,529,000,000
GBP
|
— | — | — | — | — | — | — | — | — |