Statement Of Cash Flows [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Adjustments for decrease (increase) in trade and other receivables |
75,400,000
GBP
|
67,400,000
GBP
|
| Adjustments for increase (decrease) in trade and other payables |
52,800,000
GBP
|
1 18.6
GBP
|
| Adjustments for increase (decrease) in employee benefit liabilities |
11,400,000
GBP
|
4,100,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||
| Payments for share issue costs |
1,300,000
GBP
|
3 4.9
GBP
|
| Payments for debt issue costs |
2,800,000
GBP
|
4 1.9
GBP
|