- Companies
- Machinery repair and installation
- Brandon
- Diag Test Limited
Diag Test Limited
- Company number
- 08151678
- Incorporated
- 20 Jul 201214 years trading
- Registered office
- Mayfair House Brandon Lane, Brandon, Durham, DH7 8PG
- Nature of business
- Repair and maintenance of other transport equipment n.e.c.
Diag Test Limited is a 14-year-old private limited company registered in Brandon, company number 08151678, one of 6 machinery repair and installation companies in Brandon. Its next accounts are due at Companies House on 30 April 2027, and the CT600 for the period to 31 July 2026 is due at HMRC on 31 July 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Diag Test LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £557K (-83.3%) on the year before, to £112K.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £133K against £69K owed within a year: 1.9 times cover.
- 7 employees on average, up from 5 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jul 2025 | £112K | £85K | £133K | £69K | 7 |
| 31 Jul 2024 | £668K | £657K | £721K | £93K | 5 |
| 31 Jul 2023 | £637K | £634K | £667K | £113K | 4 |
| 31 Jul 2022 | £533K | £522K | £572K | £115K | 4 |
| 31 Jul 2021 | £433K | £409K | £472K | £133K | 7 |
| 31 Jul 2020 | £383K | £229K | £497K | £135K | 9 |
| 31 Jul 2019 | £289K | £275K | £97K | 7 | |
| 31 Jul 2018 | £224K | £243K | £78K | ||
| 31 Jul 2017 | £140K | £139K | £77K | ||
| 31 Jul 2016 | £101K | £55K | £87K | £50K |
Where Diag Test Limited is registered
The registered office is in Brandon (DH7), in the County Durham local authority area, North East. Show DH7 8PG on a map.
Other trade companies in DH7
- Kenny's Groundworks LimitedCivil engineering
- Fastfit Automotive LimitedMechanics and garages
- Adobe Builders LtdFinishing trades
- Unlimited Labs LtdCivil engineering
- HLS Domestic Installations LtdInstallers
- J Moore Brickwork LtdBuilders
- Signature Developments (Ne) LtdBuilders
- D.R Groundworks & Landscaping Services LtdBuilders
What happens if Diag Test Limited 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 30 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 May 2027 to 31 May 2027 | £150 |
| 1 to 3 months late | 1 Jun 2027 to 31 Jul 2027 | £375 |
| 3 to 6 months late | 1 Aug 2027 to 31 Oct 2027 | £750 |
| More than 6 months late | From 1 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 08151678
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 July 2012 (14 years ago)
- Registered office
- Mayfair House Brandon Lane, Brandon, Durham, DH7 8PG
- Nature of business
- Repair and maintenance of other transport equipment n.e.c. (SIC 33170)
- Year end
- 31 July (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 July 2025
- Last confirmation statement
- 20 July 2026
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies in Brandon
Other active machinery repair and installation companies registered in Brandon.
- Duogas Services Limited2024
- Gibson Refridgeration Limited2011
- Suffolk Machine Knives Limited2010
- Air Cooled Environments Limited2013
- Breckland Maintenance Services Ltd2006
All machinery repair and installation companies in Brandon · All trades in Brandon · Machinery repair and installation across the UK
Frequently asked questions
When are Diag Test Limited's accounts due?
Diag Test Limited's next accounts are due at Companies House by 30 April 2027 (in 199 days), covering the period to 31 July 2026.
When is Diag Test Limited's CT600 due?
The CT600 for the period to 31 July 2026 is due at HMRC by 31 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 May 2027.
Is Diag Test Limited still trading?
Diag Test Limited 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 Test Limited do?
Diag Test Limited is registered under Repair and maintenance of other transport equipment n.e.c. (SIC 33170).
How old is Diag Test Limited?
Diag Test Limited was incorporated on 20 July 2012, 14 years ago.
What is the penalty if Diag Test Limited 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 Test Limited 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.