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 |
32,700,000
GBP
|
44,900,000
GBP
|
| Adjustments for increase (decrease) in trade and other payables |
22,500,000
GBP
|
17,500,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||
| Dividends received from associates, classified as investing activities |
100,000
GBP
|
6,100,000
GBP
|
| Proceeds from sales of interests in associates |
21,200,000
GBP
|
–
GBP
|
| Cash advances and loans made to related parties |
14,000,000
GBP
|
13,100,000
GBP
|
| Purchase of investment property |
–
GBP
|
200,000
GBP
|
| Proceeds from sales of investment property |
355,400,000
GBP
|
5 6.4
GBP
|
| Payments for development project expenditure |
55,800,000
GBP
|
49,600,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||
| Proceeds from sale or issue of treasury shares |
100,000
GBP
|
200,000
GBP
|