UNBLOC DRAINAGE ENGINEERS LIMITED
UNBLOC DRAINAGE ENGINEERS LIMITED is a private limited company registered in England and Wales under company number 01456790, according to Companies House records retrieved on 22 September 2026. The company was incorporated on 25 October 1979 and its current status is listed as Active. It was formerly registered as DAVID MARSHALL DRAINAGE LIMITED and, before that, as DAVID MARSHALL HEATING LIMITED.
The registered office is at Unit 4 Trade City Lyon Way, Frimley, Surrey, GU16 7AL, United Kingdom. Companies House classifies the company’s principal business activity under UK SIC code 37000 (Sewerage), consistent with drainage engineering and drain-clearance services. The company’s own website is unbloc.co.uk.
UNBLOC DRAINAGE ENGINEERS LIMITED filed accounts made up to 31 July 2025, with its next accounts due by 30 April 2027, and its latest confirmation statement was dated 20 December 2025. No stock-exchange listing has been identified for this entity, and no reliably sourced revenue or headcount figures were located beyond the filed accounts references above.
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Shareholders
Shareholders of UNBLOC DRAINAGE ENGINEERS LIMITED
Companies House records one active person with significant control (PSC) for UNBLOC DRAINAGE ENGINEERS LIMITED (company number 01456790): Mr Paul Stuart Marshall, whose interest was notified on 1 December 2016 as ownership of 75% or more of the company’s shares and voting rights. UK private companies are not required to file a full shareholder register beyond PSC and confirmation-statement disclosures, so no complete cap table is published. This appears to be the sole disclosed PSC; no additional shareholders or corporate members were identified in the filings reviewed.
Ultimate beneficial ownership
Mr Paul Stuart Marshall is recorded as the ultimate beneficial owner, holding a direct interest of 75% or more of shares and voting rights, notified 1 December 2016. No indirect ownership chain applies, as the interest is held directly.
Data availability
Major shareholders only: Companies House publishes PSC-threshold ownership bands (25%, 50%, 75%+) rather than exact percentages or a full shareholder register, so disclosure is partial by design of the UK regime.
Sources
- Companies House, Persons with Significant Control – UNBLOC DRAINAGE ENGINEERS LIMITED, https://find-and-update.company-information.service.gov.uk/company/01456790/persons-with-significant-control, retrieved 22 September 2026.
Officers
5
Directors and officers of UNBLOC DRAINAGE ENGINEERS LIMITED
As of the live Companies House officers register (retrieved 22 September 2026), UNBLOC DRAINAGE ENGINEERS LIMITED has 2 active directors and 6 resigned officers. The current directors are Paul Stuart Marshall (appointed 1 August 1996; nationality British; country of residence United Kingdom) and Frances Mary Marshall (appointed 1 August 2008; nationality Irish; country of residence England). No company secretary is currently disclosed. Note that the site’s previously cached officer data did not reflect these two active directors and should be treated as outdated relative to the live register.
Recent officer changes
- Elizabeth Marie Marshall resigned as director on 16 November 2022 (source: Companies House officers register).
Data availability
Current only for active officers, with historical resigned officers also shown by Companies House; nationality and country of residence are disclosed for both current directors per the live register.
Sources
- Companies House, Officers – UNBLOC DRAINAGE ENGINEERS LIMITED, https://find-and-update.company-information.service.gov.uk/company/01456790/officers, retrieved 22 September 2026.
Group Structure
Group structure of UNBLOC DRAINAGE ENGINEERS LIMITED
UNBLOC DRAINAGE ENGINEERS LIMITED is the verified ultimate parent of a small corporate group. Companies House PSC filings held on each subsidiary’s own record confirm two direct subsidiaries: UNBLOC DRAIN SERVICES LIMITED (company number 09265898) and DRAIN SERVICES LIMITED (company number 03199803), both active UK private limited companies in which UNBLOC DRAINAGE ENGINEERS LIMITED holds 75% or more of shares and voting rights, together with the right to appoint or remove directors. Both subsidiaries share the same registered office address as UNBLOC DRAINAGE ENGINEERS LIMITED, though the corporate relationship is established by the PSC filings, not by the shared address. No parent company of UNBLOC DRAINAGE ENGINEERS LIMITED itself was identified; its own PSC register names an individual, Paul Stuart Marshall, rather than a corporate parent. Information as of 22 September 2026.
Verified corporate relationships
| Entity | Country | Registration number | Relationship | Ownership | Status | Information date |
|---|---|---|---|---|---|---|
| UNBLOC DRAIN SERVICES LIMITED | GB | 09265898 | Direct subsidiary | 75% or more | Active | 5 July 2022 |
| DRAIN SERVICES LIMITED | GB | 03199803 | Direct subsidiary | 75% or more | Active | 6 April 2016 |
Recent structural changes
- UNBLOC DRAINAGE ENGINEERS LIMITED replaced Paul Stuart Marshall as the registered PSC of UNBLOC DRAIN SERVICES LIMITED on 5 July 2022, consolidating direct corporate ownership of that subsidiary.
Data availability
Full: both subsidiary relationships are verified directly on each subsidiary’s own PSC filing citing UNBLOC DRAINAGE ENGINEERS LIMITED (01456790) as the controlling entity.
Sources
- Companies House, Persons with Significant Control – UNBLOC DRAIN SERVICES LIMITED, https://find-and-update.company-information.service.gov.uk/company/09265898/persons-with-significant-control, retrieved 22 September 2026.
- Companies House, Persons with Significant Control – DRAIN SERVICES LIMITED, https://find-and-update.company-information.service.gov.uk/company/03199803/persons-with-significant-control, retrieved 22 September 2026.
UNBLOC DRAINAGE ENGINEERS LIMITED
United Kingdom
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Frequently Asked Questions
What does UNBLOC DRAINAGE ENGINEERS LIMITED do?
Drainage engineering and sewerage services (UK SIC 37000), registered in England since 25 October 1979.
Who owns UNBLOC DRAINAGE ENGINEERS LIMITED?
One disclosed PSC, Paul Stuart Marshall, holding 75% or more of shares, notified 1 December 2016; no full shareholder register published.
Who is UNBLOC DRAINAGE ENGINEERS LIMITED's UBO (Ultimate Beneficial Owner)?
Paul Stuart Marshall (British), direct interest of 75% or more, notified 1 December 2016.
What is UNBLOC DRAINAGE ENGINEERS LIMITED's company registration number?
UNBLOC DRAINAGE ENGINEERS LIMITED's registration number is 01456790, filed with Companies House in United Kingdom. Its current status on the register is active.
Is UNBLOC DRAINAGE ENGINEERS LIMITED still an active company?
UNBLOC DRAINAGE ENGINEERS LIMITED's status on Companies House is listed as active.
When was UNBLOC DRAINAGE ENGINEERS LIMITED incorporated?
UNBLOC DRAINAGE ENGINEERS LIMITED was incorporated on 25 October 1979, according to Companies House.
What is UNBLOC DRAINAGE ENGINEERS LIMITED's registered address?
The registered address on file for UNBLOC DRAINAGE ENGINEERS LIMITED is SURREY, United Kingdom.
What legal structure is UNBLOC DRAINAGE ENGINEERS LIMITED registered as?
UNBLOC DRAINAGE ENGINEERS LIMITED is registered as a Private limited company (Ltd.) in United Kingdom.
Who are the officers/directors of UNBLOC DRAINAGE ENGINEERS LIMITED?
2 active directors: Paul Stuart Marshall (since 1 August 1996) and Frances Mary Marshall (since 1 August 2008); 6 resigned officers on record.
Does UNBLOC DRAINAGE ENGINEERS LIMITED have a parent company or subsidiaries?
Ultimate parent of two verified subsidiaries, Unbloc Drain Services Limited (09265898) and Drain Services Limited (03199803), each 75% or more owned via PSC filings.
Can Zavia monitor changes to UNBLOC DRAINAGE ENGINEERS LIMITED's ownership over time?
This profile reflects a point-in-time snapshot from Companies House. Zavia's monitoring API can track changes to UNBLOC DRAINAGE ENGINEERS LIMITED's registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access UNBLOC DRAINAGE ENGINEERS LIMITED's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including United Kingdom, so records like UNBLOC DRAINAGE ENGINEERS LIMITED's registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from Companies House and was last synced on 22 September 2026.