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 |
71,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
74,700,000
GBP
|
— | — | — |
71,400,000
GBP
|
— | — | — | — |
| Current tax assets |
9,700,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
8,900,000
GBP
|
— | — | — |
5,400,000
GBP
|
— | — | — | — |
| Cash and cash equivalents |
2,525,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,994,100,000
GBP
|
— | — | — |
1,930,500,000
GBP
|
— | — | — | — |
| Assets |
19,270,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
18,420,200,000
GBP
|
— | — | — |
16,653,600,000
GBP
|
— | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital |
210,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
228,700,000
GBP
|
— | — | — |
241,400,000
GBP
|
— | — | — | — |
| Treasury shares |
65,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
75,600,000
GBP
|
— | — | — |
48,000,000
GBP
|
— | — | — | — |
| Equity |
1,419,500,000
GBP
|
70,200,000
GBP
|
210,600,000
GBP
|
71,400,000
GBP
|
1,242,100,000
GBP
|
65,400,000
GBP
|
31,000,000
GBP
|
70,200,000
GBP
|
1,243,400,000
GBP
|
71,400,000
GBP
|
75,600,000
GBP
|
228,700,000
GBP
|
1,410,600,000
GBP
|
12,900,000
GBP
|
70,200,000
GBP
|
71,100,000
GBP
|
1,417,300,000
GBP
|
1,151,200,000
GBP
|
48,000,000
GBP
|
241,400,000
GBP
|
71,800,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Deferred tax liabilities |
13,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
17,700,000
GBP
|
— | — | — |
44,400,000
GBP
|
— | — | — | — |
| Liabilities |
17,850,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
17,009,600,000
GBP
|
— | — | — |
15,236,300,000
GBP
|
— | — | — | — |
| Equity and liabilities |
19,270,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
18,420,200,000
GBP
|
— | — | — |
16,653,600,000
GBP
|
— | — | — | — |