Statement Of Financial Position [Abstract]
| Concept |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Property, plant and equipment | — | — |
3,809,000
GBP
|
— | — | — |
3,325,000
GBP
|
— | — | — | — | — | — | — | — |
| Right-of-use assets | — | — |
10,800,000
GBP
|
— | — | — |
12,273,000
GBP
|
— | — | — | — | — | — | — | — |
| Goodwill | — | — |
6,991,000
GBP
|
— | — | — |
6,991,000
GBP
|
— | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — |
7,433,000
GBP
|
— | — | — |
8,779,000
GBP
|
— | — | — | — | — | — | — | — |
| Deferred tax assets | — | — |
484,000
GBP
|
— | — | — |
610,000
GBP
|
— | — | — | — | — | — | — | — |
| Non-current assets | — | — |
29,517,000
GBP
|
— | — | — |
31,978,000
GBP
|
— | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Trade and other current receivables | — | — |
58,501,000
GBP
|
— | — | — |
49,436,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — |
146,304,000
GBP
|
— | — | — |
84,030,000
GBP
|
— | — | — |
94,008,000
GBP
|
— | — | — | — |
| Current assets | — | — |
204,805,000
GBP
|
— | — | — |
133,504,000
GBP
|
— | — | — | — | — | — | — | — |
| Assets | — | — |
234,322,000
GBP
|
— | — | — |
165,482,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital | — | — |
52,000
GBP
|
— | — | — |
51,000
GBP
|
— | — | — | — | — | — | — | — |
| Retained earnings | — | — |
159,399,000
GBP
|
— | — | — |
124,886,000
GBP
|
— | — | — | — | — | — | — | — |
| Share premium | — | — |
8,963,000
GBP
|
— | — | — |
8,930,000
GBP
|
— | — | — | — | — | — | — | — |
| Treasury shares | — | — |
2,377,000
GBP
|
— | — | — |
473,000
GBP
|
— | — | — | — | — | — | — | — |
| Equity |
2,377,000
GBP
|
159,399,000
GBP
|
166,037,000
GBP
|
8,963,000
GBP
|
52,000
GBP
|
473,000
GBP
|
133,394,000
GBP
|
51,000
GBP
|
124,886,000
GBP
|
8,930,000
GBP
|
130,708,000
GBP
|
122,739,000
GBP
|
740,000
GBP
|
51,000
GBP
|
8,658,000
GBP
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||
| Non-current provisions | — | — |
2,165,000
GBP
|
— | — | — |
2,004,000
GBP
|
— | — | — | — | — | — | — | — |
| Non-current liabilities | — | — |
13,031,000
GBP
|
— | — | — |
14,399,000
GBP
|
— | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Current provisions [abstract] | |||||||||||||||
| Current provisions | — | — |
1,126,000
GBP
|
— | — | — |
519,000
GBP
|
— | — | — | — | — | — | — | — |
| Trade and other current payables | — | — |
52,437,000
GBP
|
— | — | — |
15,604,000
GBP
|
— | — | — | — | — | — | — | — |
| Current liabilities | — | — |
55,254,000
GBP
|
— | — | — |
17,689,000
GBP
|
— | — | — | — | — | — | — | — |
| Liabilities | — | — |
68,285,000
GBP
|
— | — | — |
32,088,000
GBP
|
— | — | — | — | — | — | — | — |