- Companies
- Machinery repair and installation
- London
- London Diamond Alloy Ltd
London Diamond Alloy Ltd
- Company number
- 08360272
- Incorporated
- 15 Jan 201313 years trading
- Registered office
- Unit 2 Heliport Industrial Estate, Off Lombard Road, London, SW11 3SS
- Nature of business
- Repair and maintenance of other transport equipment n.e.c.
London Diamond Alloy Ltd is a 13-year-old private limited company registered in London, company number 08360272, one of 1,743 machinery repair and installation companies in London. Its next accounts are due at Companies House on 26 December 2026, and the CT600 for the period to 26 March 2026 is due at HMRC on 26 March 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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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 up £4,658 (+402.9%) on the year before, to £5,814.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £5,814 against £50K owed within a year: 0.1 times cover.
- 1 employee on average during the year.
- 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 |
|---|---|---|---|---|---|
| 26 Mar 2025 | £5,814 | £3,753 | £5,814 | £50K | 1 |
| 27 Mar 2024 | £1,156 | £1,156 | 1 | ||
| 31 Mar 2023 | £39K | £39K | £39K | 1 | |
| 30 Mar 2022 | £39K | £12K | £40K | £906 | 1 |
| 31 Mar 2021 | £31K | £14K | £33K | £2,064 | 1 |
| 31 Mar 2020 | £35K | £5,774 | £43K | £7,795 | 1 |
| 31 Mar 2019 | £22K | £24K | £63K | £41K | |
| 31 Mar 2018 | £100 | £8,491 | £10K | £10K | |
| 31 Mar 2017 | £100 | £30K | £30K | £37K | |
| 31 Mar 2016 | £100 | £118K | £123K | £45K |
Where London Diamond Alloy Ltd is registered
The registered office is in London (SW11), in the Wandsworth local authority area, London. Show SW11 3SS on a map.
Other trade companies in SW11
- Clean Easy Commercial LimitedCleaning companies
- Sarq LtdBuilders
- Reseq & Rozy LtdMechanics and garages
- Traditional Restoration LimitedSpecialist contractors
- Plumbing Waters LtdPlumbers and heating engineers
- F&F General Builder LtdInstallers
- Octavias Property Investments LtdProperty developers
- Gmca Cleans LtdCleaning companies
What happens if London Diamond Alloy 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 26 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 27 Dec 2026 to 26 Jan 2027 | £150 |
| 1 to 3 months late | 27 Jan 2027 to 26 Mar 2027 | £375 |
| 3 to 6 months late | 27 Mar 2027 to 26 Jun 2027 | £750 |
| More than 6 months late | From 27 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 27 Mar 2027 | £200 |
| 3 months late | 26 Jun 2027 | another £200 |
| 6 months late | 26 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 26 Mar 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
- 08360272
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 January 2013 (13 years ago)
- Registered office
- Unit 2 Heliport Industrial Estate, Off Lombard Road, London, SW11 3SS
- Nature of business
- Repair and maintenance of other transport equipment n.e.c. (SIC 33170)
- Year end
- 26 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 26 March 2025
- Last confirmation statement
- 15 November 2025
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 London
Other active machinery repair and installation companies registered in London.
- London Electrical & Plumbing Ltd2024
- London Electrical and Electronics UK Ltd2021
- London Spin Doctor Limited2022
- London Sterilisation Ltd2013
- London Tools Sharpening Ltd2023
- London Utility Services Ltd2021
- Longlivechief58 Ltd2018
- Longus Solar Power Engineering Limited2017
All machinery repair and installation companies in London · All trades in London · Machinery repair and installation across the UK
Frequently asked questions
When are London Diamond Alloy Ltd's accounts due?
London Diamond Alloy Ltd's next accounts are due at Companies House by 26 December 2026 (in 74 days), covering the period to 26 March 2026.
When is London Diamond Alloy Ltd's CT600 due?
The CT600 for the period to 26 March 2026 is due at HMRC by 26 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 27 December 2026.
Is London Diamond Alloy Ltd still trading?
London Diamond Alloy 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 London Diamond Alloy Ltd do?
London Diamond Alloy Ltd is registered under Repair and maintenance of other transport equipment n.e.c. (SIC 33170).
How old is London Diamond Alloy Ltd?
London Diamond Alloy Ltd was incorporated on 15 January 2013, 13 years ago.
What is the penalty if London Diamond Alloy 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 London Diamond Alloy 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.