Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) investing activities [abstract] | ||
| Purchase of financial instruments, classified as investing activities |
187,000,000
GBP
|
188,200,000
GBP
|
| Proceeds from sales or maturity of financial instruments, classified as investing activities |
131,100,000
GBP
|
233,300,000
GBP
|