---
title: "UNVENTED CYLINDER SPECIALIST LTD — Ownership Dossier"
canonical: https://whiteintel.dev/entity/b6ffdbf7-de8e-54bb-85c4-0b2b6b2bf303
json: https://whiteintel.dev/api/public/dossier/b6ffdbf7-de8e-54bb-85c4-0b2b6b2bf303
identifier: oo:GB-COH-11203158
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# UNVENTED CYLINDER SPECIALIST LTD

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-11203158`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/b6ffdbf7-de8e-54bb-85c4-0b2b6b2bf303  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/b6ffdbf7-de8e-54bb-85c4-0b2b6b2bf303  

## Ownership & control

### Owners / controllers

- **Mr John Andrew Swain** (beneficial owner) — 50% — https://whiteintel.dev/entity/2fee303b-e730-5971-9ea9-4c545edd7613
- **Mrs Tracey Marie Swain** (beneficial owner) — 50% — https://whiteintel.dev/entity/3f4b5195-0e69-58a4-8abe-ff6a95972821
- **Mr John Andrew Swain** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/a4d1899b-9b60-4495-891a-fa25157902bf
- **Mrs Tracey Marie Swain** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/c4d34151-9202-4efa-a0af-234ef002bd97

### UBO chain (walk to the ultimate owner)

A **4-step** ownership/control chain to the ultimate beneficial owner is resolved for this entity. The full cited chain unlocks with a paid API key or a one-off dossier — https://whiteintel.dev/pricing.

## Company profile (live · UK Companies House)

- **Company number:** `11203158`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2018-02-13
- **Registered office:** 17 Hall Flat Lane, Balby, Doncaster, South Yorkshire, DN4 8QA, England
- **SIC:** 43220

### Officers

- SWAIN, John Andrew — director · British · appointed 2018-02-13
- SWAIN, Tracey Marie — director · British · appointed 2021-03-01

### Beneficial owners (Persons with Significant Control)

- Mrs Tracey Marie Swain — 25–50% shares · individual PSC · England — since 2022-12-12
- Mr John Andrew Swain — 25–50% shares · individual PSC · United Kingdom — since 2018-02-13

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/11203158
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/11203158

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **UNVENTED CYLINDER SPECIALIST LTD**. Human view: https://whiteintel.dev/entity/b6ffdbf7-de8e-54bb-85c4-0b2b6b2bf303 · Structured JSON: https://whiteintel.dev/api/public/dossier/b6ffdbf7-de8e-54bb-85c4-0b2b6b2bf303._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._