Analysis Of Income And Expense [Abstract]
| Concept |
2022-01-01 to 2022-12-30 |
2022-01-01 to 2022-12-30 |
2022-01-01 to 2022-12-30 |
2022-01-01 to 2022-12-30 |
2022-01-01 to 2022-12-30 |
2022-01-01 to 2022-12-30 |
2020-12-26 to 2021-12-31 |
2020-12-26 to 2021-12-31 |
2020-12-26 to 2021-12-31 |
2020-12-26 to 2021-12-31 |
2020-12-26 to 2021-12-31 |
2020-12-26 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||
| Revenue [abstract] | ||||||||||||
| Revenue | — | — | — |
323,100,000
GBP
|
— | — | — | — | — | — | — |
353,700,000
GBP
|
| Material income and expense [abstract] | ||||||||||||
| Impairment loss (reversal of impairment loss) on trade receivables [abstract] | ||||||||||||
| Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables | — | — | — |
3,400,000
GBP
|
— | — | — | — | — | — | — |
3,700,000
GBP
|
| Miscellaneous other comprehensive income [abstract] | ||||||||||||
| Increase (decrease) in accumulated deferred tax recognised in other comprehensive income due to change in tax rate | — | — | — |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
1,900,000
GBP
|
–
GBP
|
–
GBP
|
1,900,000
GBP
|
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||
| Comprehensive income |
271,500,000
GBP
|
–
GBP
|
–
GBP
|
271,500,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
25,500,000
GBP
|
–
GBP
|
–
GBP
|
25,500,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — |
271,500,000
GBP
|
— | — | — | — | — | — | — |
25,500,000
GBP
|