---
title: "AMBEROAK LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/369d6487-5700-52fc-b8ee-2c86770e9172
json: https://whiteintel.dev/api/public/dossier/369d6487-5700-52fc-b8ee-2c86770e9172
identifier: oo:GB-COH-07302918
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# AMBEROAK LIMITED

**Type:** Company  
**Jurisdiction:** GB  
**Identifier:** `oo:GB-COH-07302918`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/369d6487-5700-52fc-b8ee-2c86770e9172  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/369d6487-5700-52fc-b8ee-2c86770e9172  

## Ownership & control

### Owners / controllers

- **Dr Sarah Jane Merrett** (beneficial owner) — 50% — https://whiteintel.dev/entity/7d8b2544-04db-534b-a743-f1f1608ee047
- **MASONWORTH LIMITED** (beneficial owner) — 50% — https://whiteintel.dev/entity/9d50f792-adca-5d63-8cc0-9605f938be98
- **Dr David Joseph Merrett** (beneficial owner) — 75% — https://whiteintel.dev/entity/da6c6a45-8804-544b-9627-f940091f040f
- **Dr Mark Gordon Robotham** (beneficial owner) — 50% — https://whiteintel.dev/entity/163195fd-2fa3-57d8-b82e-8bbe50ab4ee4
- **Dr David Joseph Merrett** (beneficial owner) — 62.5% — https://whiteintel.dev/entity/aa03826c-0c7c-45c3-8ad5-f6f03c3aa442
- **Dr Mark Gordon Robotham** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/050e95ea-4e85-41d2-80e7-96d4070687a5
- **MASONWORTH LIMITED** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/9d50f792-adca-5d63-8cc0-9605f938be98
- **Dr Sarah Jane Merrett** (beneficial owner) — https://whiteintel.dev/entity/472ada2e-d984-4ad2-b1b0-084cbd85f91c

### Holdings / subsidiaries

- **NEWPORT ORTHODONTICS LIMITED** (beneficial owner) — 100% — https://whiteintel.dev/entity/6a3c8b8d-fea1-56eb-b0e8-76a41a1ed7c7
- **CLYTHA PARK ORTHODONTICS LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/71e6cc31-2725-54ed-b10f-efc67b6c168b
- **NEWPORT ORTHODONTICS LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/6a3c8b8d-fea1-56eb-b0e8-76a41a1ed7c7

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

A **12-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:** `07302918`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2010-07-02
- **Registered office:** 46 - 48 Station Road, Llanishen, Cardiff, CF14 5LU, Wales
- **SIC:** 86230

### Officers

- BROWN, Angharad, Dr — director · British · appointed 2021-12-21
- MERRETT, Sarah Jane, Dr — director · British · appointed 2021-12-21
- JOHN, Ceri Richard — director · British · appointed 2010-07-02 · resigned 2010-10-18
- MERRETT, David Joseph, Dr — director · British · appointed 2010-10-18 · resigned 2021-12-21
- ROBOTHAM, Mark Gordon, Dr — director · British · appointed 2010-10-18 · resigned 2021-12-21

### Beneficial owners (Persons with Significant Control)

- Dr Sarah Jane Merrett — 25–50% votes · individual PSC · Wales — since 2021-12-21
- [Masonworth Limited](https://whiteintel.dev/entity/9d50f792-adca-5d63-8cc0-9605f938be98) — 25–50% shares · corporate PSC · Wales — since 2021-12-21
- Dr David Joseph Merrett — 50–75% shares · individual PSC · Wales — ceased 2021-12-21
- Dr Mark Gordon Robotham — 25–50% shares · individual PSC · Wales — ceased 2021-12-21

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/07302918
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/07302918

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **AMBEROAK LIMITED**. Human view: https://whiteintel.dev/entity/369d6487-5700-52fc-b8ee-2c86770e9172 · Structured JSON: https://whiteintel.dev/api/public/dossier/369d6487-5700-52fc-b8ee-2c86770e9172._

_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"._