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 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 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 2022-09-30 |
As at 2022-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment |
1,561,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,617,000,000
GBP
|
— | — | — | — | — | — | — |
| Right-of-use assets |
362,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
326,000,000
GBP
|
— | — | — | — | — | — | — |
| Investments accounted for using equity method |
56,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
55,000,000
GBP
|
— | — | — | — | — | — | — |
| Current tax assets |
249,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
112,000,000
GBP
|
— | — | — | — | — | — | — |
| Deferred tax assets |
889,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
653,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash and cash equivalents |
1,078,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,345,000,000
GBP
|
— |
1,850,000,000
GBP
|
— | — | — | — | — |
| Assets |
27,826,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
29,491,000,000
GBP
|
— | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital |
91,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
97,000,000
GBP
|
— | — | — | — | — | — | — |
| Retained earnings |
479,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
674,000,000
GBP
|
— | — | — | — | — | — | — |
| Equity attributable to owners of parent |
5,442,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
6,021,000,000
GBP
|
— | — | — | — | — | — | — |
| Non-controlling interests |
587,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
621,000,000
GBP
|
— | — | — | — | — | — | — |
| Equity |
6,029,000,000
GBP
|
5,849,000,000
GBP
|
91,000,000
GBP
|
5,442,000,000
GBP
|
19,000,000
GBP
|
587,000,000
GBP
|
479,000,000
GBP
|
5,843,000,000
GBP
|
755,000,000
GBP
|
674,000,000
GBP
|
621,000,000
GBP
|
6,021,000,000
GBP
|
97,000,000
GBP
|
6,642,000,000
GBP
|
5,837,000,000
GBP
|
7,473,000,000
GBP
|
6,860,000,000
GBP
|
443,000,000
GBP
|
613,000,000
GBP
|
1,363,000,000
GBP
|
103,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Current tax liabilities |
412,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
418,000,000
GBP
|
— | — | — | — | — | — | — |
| Deferred tax liabilities |
780,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
871,000,000
GBP
|
— | — | — | — | — | — | — |
| Liabilities |
21,797,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
22,849,000,000
GBP
|
— | — | — | — | — | — | — |