chguide.co.uk

What It Is

CH Guide is an unofficial, community-developed developer guide for Companies House data products. Its goal is to organize information scattered across official documentation, forums, and practical experience into clearer developer-oriented material. It does not directly provide a data API or hosting service; instead, it helps developers understand how to use Companies House bulk files, REST API, Streaming API, and Document API.

Core Capabilities and Use Cases

Based on the crawled content, CH Guide focuses on explaining which data access method fits which scenario. The REST API is better suited to one-off queries, such as retrieving a company’s registered office address or finding the companies where a person serves as a director. Bulk data combined with the Streaming API is more suitable for maintaining a local database that stays in sync with Companies House. The documentation also explicitly lists the seven Streaming API streams: companies, filings, officers, persons-with-significant-control, charges, insolvency-cases, and disqualified-officers, and provides a unified stream base URL.

API, Ecosystem, and Documentation Quality

CH Guide itself does not provide an SDK or proprietary API, but it explains the official Companies House REST API, Document API, and Streaming API. One particularly valuable aspect is its engineering-focused warnings: streaming endpoints may frequently go offline or return errors, and Companies House usually disconnects all streams every night between 2–3 a.m., so applications must support automatic reconnection. This kind of information is important for real production systems. However, the REST API page is clearly marked as incomplete, indicating that current coverage is still limited and depends on community pull requests for improvement.

Pricing and Open-Source Status

The reviewed content does not mention fees, subscriptions, or an enterprise edition, so as a public guide it can be considered free to access. The site describes itself as a community-driven effort and invites pull requests, but the crawled content does not clearly provide a license, repository, or formal open-source statement. Therefore, its open-source status should be treated cautiously as unspecified.

Pros, Cons, and Suitable Users

Its strengths are aggregating information, explaining practical usage, and highlighting common pitfalls. It is especially suitable for developers working on UK company data ETL, risk control, compliance, business information databases, or data synchronization systems. Its drawbacks are that it is unofficial, some content is incomplete, and there is no information about commercial support or SLA. Key API details should still be verified against the official Companies House documentation.

Access from China

The crawled content does not provide information about access from mainland China, network connectivity, or payment, so this remains unknown. Domestic teams using this guide should also keep backups of official documentation links and evaluate the connectivity of the Companies House API itself. Alternative resources include the official Companies House documentation, official API reference, and developer forum.