# MAINLINE ENVIRONMENTAL SYSTEMS LIMITED (04017927)

> MAINLINE ENVIRONMENTAL SYSTEMS LIMITED is an active private limited company (company number 04017927) incorporated on 20 June 2000, registered in London Colney. Its registered activity is other construction installation (SIC 43290). Latest small accounts cover the period ending 30 June 2025, showing net assets of £269k and cash of £20k, with 1 employee on average. Net assets rose 35% on the prior period (£199k).

- Status: Active
- Incorporated: 2000-06-20
- Registered office: London Colney, AL2 1HA
- SIC 43290: Other construction installation
- Next accounts due: 2027-03-30
- Confirmation statement due: 2027-07-04
- Accounts type: TOTAL EXEMPTION FULL

By net assets it sits in the top quarter of 288 comparable companies in Hertfordshire (median £5,105, upper quartile £41k).

## Accounts (as filed)

| Period end | Net assets | Cash | Debtors | Creditors <1y | Turnover | Profit | Employees |
|---|---|---|---|---|---|---|---|
| 2025-06-30 | £269k | £20k | £405k | — | — | — | 1 |
| 2024-06-30 | £199k | £832 | £347k | — | — | — | 1 |

size band micro.

## Filing and accounts signals (facts, not a rating)

- Net assets above zero: Net assets £268,695 at 30 June 2025
- Net assets up 10% or more on the prior period: +35.1% vs prior period
- Incorporated five or more years ago: Incorporated 20 June 2000

How each signal is derived: https://firmoscan.com/methodology

## Persons with significant control

- Mr Paul John Kenyon — owns 25–50% of shares; holds 25–50% of voting rights, since 2016-04-06
- Mrs Caroline Sandra Kenyon — owns 25–50% of shares; holds 25–50% of voting rights, since 2016-04-06

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Source: Companies House register snapshot 2026-08-31, Open Government Licence v3.0. Information may have changed since that date and is not advice or a credit reference; check the official record before relying on it. Official record: https://find-and-update.company-information.service.gov.uk/company/04017927
HTML: https://firmoscan.com/company/04017927-mainline-environmental-systems-limited