---
title: "PHASE SITE INVESTIGATIONS LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/eefdf3bd-ed40-52dd-b28a-5ce097c6f61e
json: https://whiteintel.dev/api/public/dossier/eefdf3bd-ed40-52dd-b28a-5ce097c6f61e
identifier: oo:GB-COH-06293539
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# PHASE SITE INVESTIGATIONS LIMITED

**Type:** Company  
**Jurisdiction:** GB  
**Identifier:** `oo:GB-COH-06293539`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/eefdf3bd-ed40-52dd-b28a-5ce097c6f61e  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/eefdf3bd-ed40-52dd-b28a-5ce097c6f61e  

## Ownership & control

### Owners / controllers

- **SUMO GEOPHYSICS LIMITED** (beneficial owner) — 100% — https://whiteintel.dev/entity/2692026e-a813-5630-9d84-a7bdd2666e79
- **Mrs Nicola Esther May Whittingham** (beneficial owner) — 50% — https://whiteintel.dev/entity/98b6ba7a-4957-55a3-978e-9ca59c2120a0
- **Mr Mark Whittingham** (beneficial owner) — 50% — https://whiteintel.dev/entity/0ba79f30-42f7-5bfb-92e8-75610d2f488c
- **Mrs Nicola Esther May Whittingham** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/440e484e-65bf-46d3-af92-ad9ae70c6f97
- **Mr Mark Whittingham** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/0e769450-0899-490b-9fd6-ffdc0b3c80da
- **SUMO GEOPHYSICS LIMITED** (beneficial owner) — 87.5% — https://whiteintel.dev/entity/2692026e-a813-5630-9d84-a7bdd2666e79

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

1. **SUMO GEOPHYSICS LIMITED** — beneficial owner 100% → *PHASE SITE INVESTIGATIONS LIMITED*
1. **Mrs Nicola Esther May Whittingham** — beneficial owner 50% → *PHASE SITE INVESTIGATIONS LIMITED*
1. **Mr Mark Whittingham** — beneficial owner 50% → *PHASE SITE INVESTIGATIONS LIMITED*
1. **Mrs Nicola Esther May Whittingham** — beneficial owner 37.5% → *PHASE SITE INVESTIGATIONS LIMITED*
1. **Mr Mark Whittingham** — beneficial owner 37.5% → *PHASE SITE INVESTIGATIONS LIMITED*
1. **SUMO GEOPHYSICS LIMITED** — beneficial owner 87.5% → *PHASE SITE INVESTIGATIONS LIMITED*

## Company profile (live · UK Companies House)

- **Company number:** `06293539`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2007-06-26
- **Registered office:** Unit 8 Hayward Business Centre, New Lane, Havant, Hampshire, PO9 2NL, United Kingdom
- **SIC:** 43120

### Officers

- COLLINS, Clare Elizabeth — secretary · appointed 2024-09-30
- CARNACHAN, Colin — director · British · appointed 2024-09-30
- COLLINS, Clare Elizabeth — director · British · appointed 2024-09-30
- WHITTINGHAM, Mark — director · British · appointed 2007-06-26
- WHITTINGHAM, Nicola Esther May — director · British · appointed 2007-06-26
- WORSFOLD, Ian John — director · British · appointed 2024-09-30
- WHITTINGHAM, Nicola Esther May — secretary · British · appointed 2007-06-26 · resigned 2024-09-30
- YORK PLACE COMPANY SECRETARIES LIMITED — corporate secretary · appointed 2007-06-26 · resigned 2007-06-26
- BARKER, Nigel — director · British · appointed 2007-08-08 · resigned 2010-09-20
- YORK PLACE COMPANY NOMINEES LIMITED — corporate nominee director · appointed 2007-06-26 · resigned 2007-06-26

### Beneficial owners (Persons with Significant Control)

- [Sumo Geophysics Limited](https://whiteintel.dev/entity/2692026e-a813-5630-9d84-a7bdd2666e79) — 75–100% shares · corporate PSC · England — since 2024-09-30
- Mr Mark Whittingham — 25–50% shares · individual PSC — ceased 2024-09-30
- Mrs Nicola Esther May Whittingham — 25–50% shares · individual PSC — ceased 2024-09-30

## Provenance

- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/06293539
- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/06293539

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **PHASE SITE INVESTIGATIONS LIMITED**. Human view: https://whiteintel.dev/entity/eefdf3bd-ed40-52dd-b28a-5ce097c6f61e · Structured JSON: https://whiteintel.dev/api/public/dossier/eefdf3bd-ed40-52dd-b28a-5ce097c6f61e._

_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"._