---
title: "Mr Martin John Blackwell — Ownership Dossier"
canonical: https://whiteintel.dev/entity/4cb2fc16-deaa-455c-8698-7f1d9429f80e
json: https://whiteintel.dev/api/public/dossier/4cb2fc16-deaa-455c-8698-7f1d9429f80e
identifier: psc:KPSVww6n5msFEVIlsX7rgp0EBXE
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# Mr Martin John Blackwell

**Type:** Person  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `psc:KPSVww6n5msFEVIlsX7rgp0EBXE`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/4cb2fc16-deaa-455c-8698-7f1d9429f80e  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/4cb2fc16-deaa-455c-8698-7f1d9429f80e  

## Ownership & control

### Holdings / subsidiaries

- **MJB DEVELOPMENTS (ESSEX) LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/8eb9dcbf-27d8-5449-bd59-2f171d239bb3

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **Mr Martin John Blackwell**. Human view: https://whiteintel.dev/entity/4cb2fc16-deaa-455c-8698-7f1d9429f80e · Structured JSON: https://whiteintel.dev/api/public/dossier/4cb2fc16-deaa-455c-8698-7f1d9429f80e._

_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"._