- Companies
- Mechanics and garages
- Corby
- Diag Demon Ltd
Diag Demon Ltd
- Company number
- 16708117
- Incorporated
- 10 Sep 20251 year trading
- Registered office
- 2 Regal Close, Corby, Northamptonshire, NN17 1EZ
- Nature of business
- Maintenance and repair of motor vehicles
Diag Demon Ltd is a 1-year-old private limited company registered in Corby, company number 16708117, one of 207 vehicle repair garages in Corby. Its next accounts are due at Companies House on 10 June 2027, and its first CT600 is due at HMRC on 9 September 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Who runs and owns Diag Demon Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| L*** S*** | Director | Sep 2025 |
Person with significant control
Where Diag Demon Ltd is registered
The registered office is in Corby (NN17), in the North Northamptonshire local authority area, East Midlands. Show NN17 1EZ on a map.
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What happens if Diag Demon Ltd files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 10 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 11 Jun 2027 to 10 Jul 2027 | £150 |
| 1 to 3 months late | 11 Jul 2027 to 10 Sep 2027 | £375 |
| 3 to 6 months late | 11 Sep 2027 to 10 Dec 2027 | £750 |
| More than 6 months late | From 11 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 16708117
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 September 2025 (1 year ago)
- Registered office
- 2 Regal Close, Corby, Northamptonshire, NN17 1EZ
- Nature of business
- Maintenance and repair of motor vehicles (SIC 45200)
- Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 30 September 2026
Filing notes for vehicle repair garages
Garages hold parts stock and often own diagnostic equipment and ramps, which qualify for capital allowances.
Similar companies in Corby
Other active vehicle repair garages registered in Corby.
- Diamond Windscreens Limited2003
- Dny Solutions Ltd2024
- DR Car Repair Limited2023
- Drag Car Services Ltd2019
- Dragos D Ltd2025
- DS Body Repairs Ltd2015
- Eba Refinish Ltd2019
- Elite PDR Limited2018
All vehicle repair garages in Corby · All trades in Corby · Mechanics and garages across the UK
Frequently asked questions
When are Diag Demon Ltd's accounts due?
Diag Demon Ltd's next accounts are due at Companies House by 10 June 2027 (in 240 days), covering the period to 30 September 2026.
When is Diag Demon Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 9 September 2026, due by 9 September 2027, and one for the period to 30 September 2026, due by 30 September 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Diag Demon Ltd still trading?
Diag Demon Ltd is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Diag Demon Ltd do?
Diag Demon Ltd is registered under Maintenance and repair of motor vehicles (SIC 45200).
How old is Diag Demon Ltd?
Diag Demon Ltd was incorporated on 10 September 2025, 1 year ago.
Who runs Diag Demon Ltd?
Diag Demon Ltd has 1 active director, the longest-serving appointed in Sep 2025. Their names and service addresses are on the Companies House register.
Who owns Diag Demon Ltd?
One person or company has significant control of Diag Demon Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Diag Demon Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Diag Demon Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.