Statement Of Cash Flows [Abstract]
| Concept |
2022-01-01 to 2022-12-30 |
2020-12-26 to 2021-12-31 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) investing activities [abstract] | ||
| Purchase of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets |
29,700,000
GBP
|
21,000,000
GBP
|
| Purchase of financial instruments, classified as investing activities |
177,100,000
GBP
|
948,700,000
GBP
|
| Proceeds from sales or maturity of financial instruments, classified as investing activities |
214,100,000
GBP
|
960,900,000
GBP
|