Statement Of Financial Position [Abstract]
| Concept |
As at 2024-04-30 |
As at 2024-04-30 |
As at 2024-04-30 |
As at 2024-04-30 |
As at 2024-04-30 |
As at 2024-04-30 |
As at 2024-04-30 |
As at 2024-04-30 |
As at 2024-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
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 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Property, plant and equipment |
3,743,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,529,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
237,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
224,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method |
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets |
37,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
24,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
23,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
11,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
499,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
472,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
9,254,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
9,457,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital |
138,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
138,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
2,258,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,251,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
3,949,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
4,084,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
-
GBP
|
— | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
3,949,000,000
GBP
|
138,000,000
GBP
|
89,000,000
GBP
|
1,708,000,000
GBP
|
2,258,000,000
GBP
|
–
GBP
|
57,000,000
GBP
|
3,949,000,000
GBP
|
9,000,000
GBP
|
2,251,000,000
GBP
|
4,087,000,000
GBP
|
4,084,000,000
GBP
|
3,000,000
GBP
|
1,581,000,000
GBP
|
113,000,000
GBP
|
15,000,000
GBP
|
138,000,000
GBP
|
14,000,000
GBP
|
1,352,000,000
GBP
|
105,000,000
GBP
|
2,248,000,000
GBP
|
4,232,000,000
GBP
|
2,000,000
GBP
|
137,000,000
GBP
|
9,000,000
GBP
|
4,234,000,000
GBP
|
609,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Current tax liabilities |
134,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
165,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
213,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
262,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
5,305,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,370,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |