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) operating activities [abstract] | ||
| Cash flows from (used in) operations before changes in working capital |
178,000,000
GBP
|
139,500,000
GBP
|
| Increase (decrease) in working capital |
43,200,000
GBP
|
64,500,000
GBP
|
| Adjustments for decrease (increase) in trade and other receivables |
107,800,000
GBP
|
24,400,000
GBP
|
| Adjustments for increase (decrease) in trade and other payables |
116,200,000
GBP
|
71,600,000
GBP
|
| Adjustments for decrease (increase) in accrued income including contract assets [abstract] | ||
| Adjustments for decrease (increase) in contract assets |
24,000,000
GBP
|
62,000,000
GBP
|
| Adjustments for increase (decrease) in deferred income including contract liabilities [abstract] | ||
| Adjustments for increase (decrease) in contract liabilities |
21,600,000
GBP
|
4,300,000
GBP
|
| Adjustments for increase (decrease) in employee benefit liabilities |
200,000
GBP
|
–
GBP
|
| Adjustments for amortisation expense |
2,900,000
GBP
|
2,000,000
GBP
|
| Adjustments for depreciation expense |
26,800,000
GBP
|
22,900,000
GBP
|
| Adjustments for gain (loss) on disposals, property, plant and equipment |
100,000
GBP
|
500,000
GBP
|
| Adjustments for undistributed profits of investments accounted for using equity method |
14,100,000
GBP
|
14,300,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||
| Dividends received from joint ventures, classified as investing activities |
1,600,000
GBP
|
1,400,000
GBP
|
| Cash advances and loans made to related parties |
44,200,000
GBP
|
18,300,000
GBP
|
| Cash receipts from repayment of advances and loans made to related parties |
34,200,000
GBP
|
34,600,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||
| Proceeds from exercise of options |
4,000,000
GBP
|
1,600,000
GBP
|
| Proceeds from issue of ordinary shares |
100,000
GBP
|
10,200,000
GBP
|