- Companies
- Civil engineering
- London
- Mercury Telecom Ltd
Mercury Telecom Ltd
- Company number
- 09077318
- Incorporated
- 9 Jun 201412 years trading
- Registered office
- Suite 120, Lavender Hill, London, SW11 1LJ
- Nature of business
- Construction of utility projects for electricity and telecommunications; Wired telecommunications activities; Wireless telecommunications activities
Mercury Telecom Ltd is a 12-year-old private limited company registered in London, company number 09077318, one of 1,853 civil engineering contractors in London. Companies House shows its accounts as overdue: they were due on 29 June 2026.
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 £40K (+32.6%) on the year before, to £164K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £210K against £48K owed within a year: 4.4 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2015 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 29 Jun 2024 | £164K | £210K | £48K | 0 | |
| 29 Jun 2023 | £124K | £167K | £43K | 1 | |
| 29 Jun 2022 | £138K | £179K | £42K | 1 | |
| 30 Jun 2021 | £175K | £213K | £46K | 1 | |
| 30 Jun 2020 | £176K | £219K | £52K | 1 | |
| 30 Jun 2019 | £153K | £193K | £52K | 1 | |
| 29 Jun 2018 | £147K | £177K | £48K | ||
| 30 Jun 2017 | £138K | £175K | £54K | ||
| 30 Jun 2016 | £105K | £22K | £120K | £21K | |
| 30 Jun 2015 | £64K | £42K | £87K | £31K |
Where Mercury Telecom Ltd is registered
The registered office is in London (SW11), in the Wandsworth local authority area, London. Show SW11 1LJ on a map.
Other trade companies in SW11
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- 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 Mercury Telecom Ltd files late
If the accounts reach Companies House today, the late filing penalty is £750 (£1,500 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Jun 2026 to 29 Jul 2026 | £150 |
| 1 to 3 months late | 30 Jul 2026 to 29 Sep 2026 | £375 |
| 3 to 6 months late | 30 Sep 2026 to 29 Dec 2026 | £750 |
| More than 6 months late | From 30 Dec 2026 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Sep 2026 | £200 |
| 3 months late | 29 Dec 2026 | another £200 |
| 6 months late | 29 Mar 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 Sep 2027 | 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
- 09077318
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 June 2014 (12 years ago)
- Registered office
- Suite 120, Lavender Hill, London, SW11 1LJ
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Wired telecommunications activities (SIC 61100)
Wireless telecommunications activities (SIC 61200) - Year end
- 29 June (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 29 June 2024
- Last confirmation statement
- 9 June 2026
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in London
Other active civil engineering contractors registered in London.
- Mes Consult Ltd2020
- Metcalfe Engineering Ltd2026
- Metro Piling Group Ltd2025
- MF Builders London Ltd2017
- MFL Utilities Ltd2026
- MG Engineering and Consultancy Ltd2025
- MG Ibrushi Construction Ltd2021
- MG Works Ltd2019
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Mercury Telecom Ltd's accounts due?
Mercury Telecom Ltd's accounts were due at Companies House on 29 June 2026 and the register shows them as overdue.
When is Mercury Telecom 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 29 June 2025, due by 29 June 2026, and one for the period to 29 September 2025, due by 29 September 2026. Corporation tax is payable 9 months and 1 day after the end of each.
Is Mercury Telecom Ltd still trading?
Mercury Telecom Ltd is listed as active on the Companies House register (checked 12 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 Mercury Telecom Ltd do?
Mercury Telecom Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Wired telecommunications activities (SIC 61100); Wireless telecommunications activities (SIC 61200).
How old is Mercury Telecom Ltd?
Mercury Telecom Ltd was incorporated on 9 June 2014, 12 years ago.
What is the penalty if Mercury Telecom 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 Mercury Telecom Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.