Statement Of Cash Flows [Abstract]
| Concept |
2023-07-01 to 2024-06-30 |
2022-07-01 to 2023-06-30 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Adjustments for interest income |
4,700,000
GBP
|
3,000,000
GBP
|
| Adjustments for dividend income |
5,400,000
GBP
|
4,700,000
GBP
|
| Adjustments for increase (decrease) in trade and other payables |
4,900,000
GBP
|
1,700,000
GBP
|
| Adjustments for increase (decrease) in deferred income including contract liabilities [abstract] | ||
| Adjustments for increase (decrease) in deferred income including contract liabilities |
4,500,000
GBP
|
400,000
GBP
|
| Adjustments for depreciation expense |
1,000,000
GBP
|
1,100,000
GBP
|
| Income taxes paid, classified as operating activities |
100,000
GBP
|
400,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||
| Purchase of investments other than investments accounted for using equity method |
200,000
GBP
|
100,000
GBP
|