---
title: "ESTUARY DIAGNOSTICS LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/5f0e4e9b-017e-582a-ad61-00eafb1bbbc0
json: https://whiteintel.dev/api/public/dossier/5f0e4e9b-017e-582a-ad61-00eafb1bbbc0
identifier: oo:GB-COH-10647911
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# ESTUARY DIAGNOSTICS LIMITED

**Type:** Company  
**Jurisdiction:** [GB](https://whiteintel.dev/jurisdictions/gb)  
**Identifier:** `oo:GB-COH-10647911`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/5f0e4e9b-017e-582a-ad61-00eafb1bbbc0  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/5f0e4e9b-017e-582a-ad61-00eafb1bbbc0  

## Ownership & control

### Owners / controllers

- **Dr Jemima Louise Ewart** (beneficial owner) — 50% — https://whiteintel.dev/entity/d02018f7-106a-57f4-a98c-987011657811
- **Dr Simon William Brian Ewart** (beneficial owner) — 50% — https://whiteintel.dev/entity/98f8fdaa-ef2c-5f9b-b658-9f0a6efe3604
- **Dr Jemima Louise Ewart** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/a4c7f02e-010d-4895-8cbf-cd0524456499
- **Dr Simon William Brian Ewart** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/d63011bf-70e9-418c-bab1-00c4d5347959

### 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:** `10647911`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2017-03-02
- **Registered office:** The Summit Woodwater Park, Pynes Hill, Exeter, Devon, EX2 5WS, United Kingdom
- **SIC:** 86220

## Financials (Companies House accounts)

| Figure | 2026-03-31 |
|---|---:|
| Net assets | £14,208 |
| Shareholder funds | £14,208 |
| Fixed assets | £1,889 |
| Current assets | £15,683 |
| Employees | 0 |

_Latest filed period. Full 2-year history unlocks with a paid dossier — https://whiteintel.dev/pricing. As filed at Companies House._

### Officers

- EWART, Jemima Louise, Dr — director · British · appointed 2017-03-02
- EWART, Simon William Brian, Dr — director · British · appointed 2017-03-02

### Beneficial owners (Persons with Significant Control)

- Dr Jemima Louise Ewart — 25–50% shares · individual PSC · United Kingdom — since 2017-03-02
- Dr Simon William Brian Ewart — 25–50% shares · individual PSC · United Kingdom — since 2017-03-02

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/10647911
- companies_house_accounts — https://find-and-update.company-information.service.gov.uk/company/10647911/filing-history
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/10647911

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **ESTUARY DIAGNOSTICS LIMITED**. Human view: https://whiteintel.dev/entity/5f0e4e9b-017e-582a-ad61-00eafb1bbbc0 · Structured JSON: https://whiteintel.dev/api/public/dossier/5f0e4e9b-017e-582a-ad61-00eafb1bbbc0._

_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"._