---
title: "Mr Martin John Blackwell — Ownership Dossier"
canonical: https://whiteintel.dev/entity/175c19d6-dbb2-5e17-81a6-0fe9c054c4d0
json: https://whiteintel.dev/api/public/dossier/175c19d6-dbb2-5e17-81a6-0fe9c054c4d0
identifier: oo-person:GB-COH-PER-08954778-KPSVww6n5msFEVIlsX7rgp0EBXE
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Mr Martin John Blackwell

**Type:** Person  
**Jurisdiction:** GB  
**Identifier:** `oo-person:GB-COH-PER-08954778-KPSVww6n5msFEVIlsX7rgp0EBXE`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/175c19d6-dbb2-5e17-81a6-0fe9c054c4d0  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/175c19d6-dbb2-5e17-81a6-0fe9c054c4d0  

## Ownership & control

### Holdings / subsidiaries

- **MJB DEVELOPMENTS (ESSEX) LIMITED** (beneficial owner) — 100% — https://whiteintel.dev/entity/8eb9dcbf-27d8-5449-bd59-2f171d239bb3

## Provenance

- OpenOwnership — https://www.openownership.org

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Mr Martin John Blackwell**. Human view: https://whiteintel.dev/entity/175c19d6-dbb2-5e17-81a6-0fe9c054c4d0 · Structured JSON: https://whiteintel.dev/api/public/dossier/175c19d6-dbb2-5e17-81a6-0fe9c054c4d0._

_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"._