- Companies
- Electricians
- London
- RJK Security Systems Limited
RJK Security Systems Limited
- Company number
- 04181946
- Incorporated
- 19 Mar 200125 years trading
- Registered office
- 1 Sovereign Business Centre, Stockingswater Lane, London, EN3 7JX
- Nature of business
- Electrical installation; Other business support service activities n.e.c.
RJK Security Systems Limited is a 25-year-old private limited company registered in London, company number 04181946, one of 3,448 electrical contractors in London. Its next accounts are due at Companies House on 28 January 2027, and the CT600 for the period to 28 April 2026 is due at HMRC on 28 April 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 £29K (+2%) on the year before, to £1.5M.
- Net assets rose in 4 of 5 year-on-year comparisons on record.
- Current assets of £1.3M against £652K owed within a year: 1.9 times cover.
- 23 employees on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2025 | £1.5M | £647K | £1.3M | £652K | 23 |
| 30 Apr 2024 | £1.5M | £537K | £1.4M | £730K | 23 |
| 30 Apr 2023 | £1.8M | £699K | £1.4M | £450K | 23 |
| 30 Apr 2022 | £1.8M | £796K | £1.9M | £492K | 17 |
| 30 Apr 2021 | £1.7M | £858K | £1.9M | £577K | 17 |
| 30 Apr 2020 | £1.4M | £417K | £1.2M | £327K | 17 |
Where RJK Security Systems Limited is registered
The registered office is in London (EN3), in the Enfield local authority area, London. Show EN3 7JX on a map.
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What happens if RJK Security Systems 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 28 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 29 Jan 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 28 Apr 2027 | £375 |
| 3 to 6 months late | 29 Apr 2027 to 28 Jul 2027 | £750 |
| More than 6 months late | From 29 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Apr 2027 | £200 |
| 3 months late | 28 Jul 2027 | another £200 |
| 6 months late | 28 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Apr 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
- 04181946
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 19 March 2001 (25 years ago)
- Registered office
- 1 Sovereign Business Centre, Stockingswater Lane, London, EN3 7JX
- Nature of business
- Electrical installation (SIC 43210)
Other business support service activities n.e.c. (SIC 82990) - Year end
- 28 April (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 23 January 2026
- Charges (mortgages)
- 2 outstanding of 2 registered
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in London
Other active electrical contractors registered in London.
- RJP Living Ltd2025
- RLR Electrical Solutions Ltd2025
- RM Electrix & Maintenance Ltd2026
- RM General Solutions Ltd2020
- RMF Electrics Limited2026
- RMG Electrical Services Limited2026
- RMW Engineering Limited2026
- RNM 61 Electrical Ltd2025
All electrical contractors in London · All trades in London · Electricians across the UK
Frequently asked questions
When are RJK Security Systems Limited's accounts due?
RJK Security Systems Limited's next accounts are due at Companies House by 28 January 2027 (in 108 days), covering the period to 28 April 2026.
When is RJK Security Systems Limited's CT600 due?
The CT600 for the period to 28 April 2026 is due at HMRC by 28 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 29 January 2027.
Is RJK Security Systems Limited still trading?
RJK Security Systems 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 RJK Security Systems Limited do?
RJK Security Systems Limited is registered under Electrical installation (SIC 43210); Other business support service activities n.e.c. (SIC 82990).
How old is RJK Security Systems Limited?
RJK Security Systems Limited was incorporated on 19 March 2001, 25 years ago.
What is the penalty if RJK Security Systems 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 RJK Security Systems 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.