---
title: "BUILDING BLOCKS LONDON LIMITED — Ownership Dossier"
canonical: https://whiteintel.dev/entity/86c614f6-ce12-5dbc-a656-fa086d8342fb
json: https://whiteintel.dev/api/public/dossier/86c614f6-ce12-5dbc-a656-fa086d8342fb
identifier: oo:GB-COH-09127171
jurisdiction: GB
risk: Low
source: WhiteIntel corporate-ownership graph
---

# BUILDING BLOCKS LONDON LIMITED

**Type:** Company  
**Jurisdiction:** GB  
**Identifier:** `oo:GB-COH-09127171`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/86c614f6-ce12-5dbc-a656-fa086d8342fb  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/86c614f6-ce12-5dbc-a656-fa086d8342fb  

## Ownership & control

### Owners / controllers

- **Mrs Helen Catherine Stuart Casson** (beneficial owner) — 50% — https://whiteintel.dev/entity/53836fb8-fa86-5af5-b775-09ecb9790c1f
- **Mrs Helen Catherine Stuart Casson** (beneficial owner) — 37.5% — https://whiteintel.dev/entity/64540ce9-bd57-41fb-8907-5f8e395220e7

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

A **2-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:** `09127171`
- **Status:** active
- **Type:** ltd
- **Incorporated:** 2014-07-11
- **Registered office:** 43 Edinburgh Gardens, Windsor, SL4 2AW, England
- **SIC:** 82990

### Officers

- CASSON, Helen Catherine Stuart — director · British · appointed 2018-10-19
- CASSON, John Stuart — director · British · appointed 2019-06-01
- DAVIES, Justin Edgar Rees, Dr — director · British · appointed 2014-07-11 · resigned 2018-10-19

### Beneficial owners (Persons with Significant Control)

- Mrs Helen Catherine Stuart Casson — 25–50% shares · individual PSC · England — since 2016-09-14

## Provenance

- companies_house_bulk — https://find-and-update.company-information.service.gov.uk/company/09127171
- OpenOwnership — https://find-and-update.company-information.service.gov.uk/company/09127171

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **BUILDING BLOCKS LONDON LIMITED**. Human view: https://whiteintel.dev/entity/86c614f6-ce12-5dbc-a656-fa086d8342fb · Structured JSON: https://whiteintel.dev/api/public/dossier/86c614f6-ce12-5dbc-a656-fa086d8342fb._

_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"._