Statement Of Cash Flows [Abstract]
| Concept |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
As at 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
As at 2021-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||
| Profit (loss) |
—
GBP
|
—
GBP
|
— |
68,219,000
GBP
|
68,219,000
GBP
|
—
GBP
|
46,739,000
GBP
|
—
GBP
|
— |
—
GBP
|
—
GBP
|
46,739,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||
| Adjustments for income tax expense | — | — | — |
19,442,000
GBP
|
— | — |
11,672,000
GBP
|
— | — | — | — | — | — |
| Adjustments for finance costs | — | — | — |
952,000
GBP
|
— | — |
768,000
GBP
|
— | — | — | — | — | — |
| Adjustments for provisions | — | — | — |
607,000
GBP
|
— | — |
1,007,000
GBP
|
— | — | — | — | — | — |
| Adjustments for share-based payments | — | — | — |
1,103,000
GBP
|
— | — |
4,728,000
GBP
|
— | — | — | — | — | — |
| Cash flows from (used in) operations | — | — | — |
120,502,000
GBP
|
— | — |
57,231,000
GBP
|
— | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — |
19,092,000
GBP
|
— | — |
11,433,000
GBP
|
— | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — |
101,410,000
GBP
|
— | — |
45,798,000
GBP
|
— | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
1,574,000
GBP
|
— | — |
1,014,000
GBP
|
— | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — |
1,926,000
GBP
|
— | — |
2,365,000
GBP
|
— | — | — | — | — | — |
| Interest received, classified as investing activities | — | — | — |
2,393,000
GBP
|
— | — |
198,000
GBP
|
— | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — |
1,107,000
GBP
|
— | — |
3,181,000
GBP
|
— | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||
| Proceeds from issuing shares | — | — | — |
34,000
GBP
|
— | — |
272,000
GBP
|
— | — | — | — | — | — |
| Payments to acquire or redeem entity's shares | — | — | — |
2,000,000
GBP
|
— | — |
—
GBP
|
— | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — |
1,576,000
GBP
|
— | — |
1,716,000
GBP
|
— | — | — | — | — | — |
| Dividends paid, classified as financing activities | — | — | — |
33,294,000
GBP
|
— | — |
50,383,000
GBP
|
— | — | — | — | — | — |
| Interest paid, classified as financing activities | — | — | — |
952,000
GBP
|
— | — |
768,000
GBP
|
— | — | — | — | — | — |
| Income taxes paid (refund), classified as financing activities | — | — | — |
241,000
GBP
|
— | — |
—
GBP
|
— | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — |
38,029,000
GBP
|
— | — |
52,595,000
GBP
|
— | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — | — | — |
62,274,000
GBP
|
— | — |
9,978,000
GBP
|
— | — | — | — | — | — |
| Cash and cash equivalents | — | — |
146,304,000
GBP
|
— | — | — | — | — |
84,030,000
GBP
|
— | — | — |
94,008,000
GBP
|