Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-09-30 |
As at 2022-09-30 |
As at 2021-09-30 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
74,700,000
GBP
|
71,400,000
GBP
|
70,400,000
GBP
|
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
168,200,000
GBP
|
170,200,000
GBP
|
170,500,000
GBP
|
| Cash and cash equivalents [abstract] | |||
| Cash [abstract] | |||
| Cash |
2,994,300,000
GBP
|
1,930,900,000
GBP
|
— |
| Cash and cash equivalents |
2,994,100,000
GBP
|
1,930,500,000
GBP
|
1,359,800,000
GBP
|
| Miscellaneous assets [abstract] | |||
| Net defined benefit asset |
12,700,000
GBP
|
7,100,000
GBP
|
-
GBP
|
| Derivative financial assets |
615,400,000
GBP
|
779,000,000
GBP
|
44,200,000
GBP
|
| Loans and advances | — | — | — |
| Loans and advances to banks |
211,000,000
GBP
|
318,400,000
GBP
|
218,100,000
GBP
|
| Loans and advances to customers |
14,495,000,000
GBP
|
13,650,400,000
GBP
|
13,408,200,000
GBP
|
| Cash and bank balances at central banks |
2,783,300,000
GBP
|
1,612,500,000
GBP
|
1,142,000,000
GBP
|
| Other assets |
51,000,000
GBP
|
39,200,000
GBP
|
69,200,000
GBP
|
| Borrowings [abstract] | |||
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
200,000
GBP
|
400,000
GBP
|
300,000
GBP
|
| Borrowings, by type [abstract] | |||
| Loans received | — | — | — |
| Secured bank loans received |
-
GBP
|
586,000,000
GBP
|
730,000,000
GBP
|
| Miscellaneous liabilities [abstract] | |||
| Net defined benefit liability |
-
GBP
|
-
GBP
|
10,300,000
GBP
|
| Derivative financial liabilities |
39,900,000
GBP
|
102,100,000
GBP
|
43,900,000
GBP
|
| Deposit liabilities | — | — | — |
| Deposits from customers [abstract] | |||
| Deposits from customers |
13,234,400,000
GBP
|
10,569,500,000
GBP
|
9,297,400,000
GBP
|
| Other liabilities |
631,200,000
GBP
|
513,100,000
GBP
|
90,700,000
GBP
|
| Issued capital [abstract] | |||
| Issued capital |
228,700,000
GBP
|
241,400,000
GBP
|
262,500,000
GBP
|
| Net assets (liabilities) [abstract] | |||
| Assets |
18,420,200,000
GBP
|
16,653,600,000
GBP
|
15,137,000,000
GBP
|
| Liabilities |
17,009,600,000
GBP
|
15,236,300,000
GBP
|
13,895,100,000
GBP
|
| Assets less current liabilities [abstract] |