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- Critical Infrastructure Services Ltd
Company profile · Civil engineering
Critical Infrastructure Services Ltd
Critical Infrastructure Services Ltd is a 4-year-old private limited company registered in March, company number 14280299, one of 16 civil engineering contractors in March. Its next accounts are due at Companies House on 31 May 2027, and the CT600 for the period to 31 August 2026 is due at HMRC on 31 August 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 August 2025, as filed at Companies House.
Critical Infrastructure Services Ltd over the years
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 £5,500 (-78.6%) on the year before, to £1,500.
- 6 employees on average during the year.
- Balance sheets on record for 3 years, 2023 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Aug 2025 | £1,500 | £5,400 | £0 | 6 | |
| 31 Aug 2024 | £7,000 | £6,000 | £0 | 6 | |
| 31 Aug 2023 | £12K | £2,600 | £0 | 7 |
Who runs and owns Critical Infrastructure Services Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| S*** L*** | Director | Aug 2022 |
Person with significant control
Where Critical Infrastructure Services Ltd is registered
The registered office is in March (PE15), in the Fenland local authority area, East of England. Show PE15 8NY on a map.
Other trade companies in PE15
- Ace Resin Surfacing LimitedFloor and wall tilers
- Impway Connections LimitedCivil engineering
- Zee Plus Services LtdFinishing trades
- Coreshine LtdCleaning companies
- J Kirby Utilities LtdCivil engineering
- M B Concierge LtdMotor traders
- WS Civil Consultant LtdCivil engineering
- Ga Motors LimitedMotor traders
What happens if Critical Infrastructure Services 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 31 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jun 2027 to 30 Jun 2027 | £150 |
| 1 to 3 months late | 1 Jul 2027 to 31 Aug 2027 | £375 |
| 3 to 6 months late | 1 Sep 2027 to 30 Nov 2027 | £750 |
| More than 6 months late | From 1 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 14280299
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 August 2022 (4 years ago)
- Registered office
- 2 the Junction, March, PE15 8NY
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 4 August 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 March
Other active civil engineering contractors registered in March.
- DJW Infastructure UK Limited2024
- DM Utilities Limited2010
- Elite Surfacing & Civils Ltd2023
- Force Construction Management Ltd2018
- Highfield Plant & Suction Ltd2026
- Impway Connections Limited2026
- J Brownlow Limited2008
- J Kirby Utilities Ltd2026
All civil engineering contractors in March · All trades in March · Civil engineering across the UK
Frequently asked questions
When are Critical Infrastructure Services Ltd's accounts due?
Critical Infrastructure Services Ltd's next accounts are due at Companies House by 31 May 2027 (in 231 days), covering the period to 31 August 2026.
When is Critical Infrastructure Services Ltd's CT600 due?
The CT600 for the period to 31 August 2026 is due at HMRC by 31 August 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 June 2027.
Is Critical Infrastructure Services Ltd still trading?
Critical Infrastructure Services 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 Critical Infrastructure Services Ltd do?
Critical Infrastructure Services Ltd is registered under Construction of railways and underground railways (SIC 42120).
How old is Critical Infrastructure Services Ltd?
Critical Infrastructure Services Ltd was incorporated on 5 August 2022, 4 years ago.
Who runs Critical Infrastructure Services Ltd?
Critical Infrastructure Services Ltd has 1 active director, the longest-serving appointed in Aug 2022. Their names and service addresses are on the Companies House register.
Who owns Critical Infrastructure Services Ltd?
One person or company has significant control of Critical Infrastructure Services Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Critical Infrastructure Services 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 Critical Infrastructure Services 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.