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Why build a gateway for UK government data?
The problem is not simply that there are several APIs. Each agency exposes information for different purposes, with different rules for identifying a record, obtaining access and handling responses. An application that connects directly to every provider must accommodate those differences throughout its own code. A gateway creates a boundary: the application makes requests to one layer, and that layer handles the provider-specific connection.
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That boundary can reduce duplicated integration work and make it easier to change one provider connection without rewriting every part of the application that uses it. Those are architectural reasons for building GovBridge; they are not claims about measured time savings, performance or the project’s actual coverage. The official agency documentation establishes the differences below, but does not independently verify GovBridge’s implementation or the author’s personal experience.
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These services are not four versions of the same public-data API. Their purposes and access conditions differ materially.
| Service | Purpose and request shape | Access and operational conditions |
|---|---|---|
| HMRC | Tax-related services, including endpoints for taxpayer information. Endpoint rules determine what data is available and how a request is authorised. | HMRC classifies endpoints as open, application-restricted or user-restricted. User-restricted data requires the user’s permission; application-restricted endpoints use client credentials and do not provide sensitive personal data. Subscriptions, scopes and endpoint-specific requirements still apply. HMRC’s documented standard limit is 3 requests per second per application. HMRC authorisation guidance; HMRC reference guide |
| Companies House | Company-register information through a REST API with JSON resources. The API is useful for company records, not a substitute for the other agencies’ datasets. | API credentials are required. The published default rate limit is up to 600 requests in a five-minute period; exceeding the limit can return HTTP 429. Companies House getting started; Companies House developer guidelines |
| DVLA Vehicle Enquiry Service | A vehicle registration number is used to request vehicle details returned as JSON. | Requests use an issued x-api-key. The official guide currently says new registrations are not being accepted while systems are upgraded, so onboarding availability must be checked against the live guidance before relying on this integration. DVLA VES API guide; DVLA API listing |
| HM Land Registry Business Gateway | A business integration channel for exchanging register information and submitting data or applications to Land Registry systems. | It is a business service with specific legal-software use cases and arrangements, not an unrestricted general-purpose public API. HM Land Registry Business Gateway guidance |
The table describes the services documented by the agencies; it should not be read as a claim that GovBridge currently supports every endpoint or has obtained every required approval.
How one gateway can present a consistent interface
A useful gateway standardises the parts that belong to the application while preserving the differences that belong to the source service. A request might pass through these logical stages:
- Identify the task. The application asks for a defined operation, such as a company record lookup, rather than sending an arbitrary request to any upstream host.
- Route to a provider-specific adapter. The adapter constructs the agency’s required request, supplies its authentication material and handles its own response format. An HMRC adapter must follow the relevant endpoint’s authorisation and version rules; a Companies House adapter must use its credentials and respect its rate limit.
- Preserve the source meaning. The gateway can expose a consistent envelope for status, errors and provenance, but it should not silently merge fields that have different definitions or imply that records from different agencies are equivalent.
- Return a clear result to the application. The caller should be able to distinguish a successful response, a missing record, an access denial, a throttled request and an upstream outage rather than receiving an ambiguous empty result.
This is a design model, not a description of GovBridge’s verified code. The project’s public architecture, supported endpoints and implementation details are not established by the agency documentation.
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What the gateway does not unify
Permissions and identity
A single application-facing endpoint does not create a single government-wide permission. HMRC user-restricted data still needs the relevant user consent; application-restricted endpoints have their own scopes and subscriptions. Companies House credentials, a DVLA-issued key and Land Registry Business Gateway arrangements are separate access mechanisms. A gateway can manage and route credentials, but it cannot grant rights that the integration has not obtained.
Data definitions and response schemas
Company information, tax data, vehicle details and property-register information describe different things. A common response wrapper can make technical handling more predictable, but any shared data model needs explicit definitions, source attribution and rules for missing or conflicting values. If the gateway flattens agency-specific fields into a generic record without preserving their meaning, it risks making data easier to consume but less accurate.
Rate limits and service availability
Limits apply at the provider boundary, not just at the gateway. HMRC documents 3 requests per second per application, while Companies House publishes a default of 600 requests per five-minute period. Those figures are not directly comparable measures of capacity: they are different provider policies with different time windows. A gateway must enforce the applicable upstream limit and account for responses such as HTTP 429. It cannot guarantee that an agency will be available or increase the quota granted to an application.
Practical design choices for a dependable integration
Keep provider adapters separate
Give each agency its own adapter for credentials, request construction, response parsing and error translation. This keeps a change to one service from becoming an accidental change to the others. Keep any shared interface narrow: common routing and error conventions are useful, while falsely uniform data fields are not.
Handle throttling and retries deliberately
Track limits per upstream application credential. When a provider throttles a request, avoid immediate repeated retries; use bounded exponential backoff with jitter and stop after a defined retry budget. Retrying a read request may be safe in some cases, but a submission or application must not be blindly repeated unless its operation is known to be safe or has an idempotency mechanism. Surface a clear temporary failure when retrying cannot resolve it.
Cache only where permitted and appropriate
Caching can reduce repeated reads, but its value and risks depend on the data, the source’s terms, how quickly records change and whether the caller is entitled to see the cached result. Set explicit expiry and invalidation rules, and never use caching to bypass a provider’s access controls or terms. The relevant agency documentation and agreement govern what is allowed.
Make failures observable
Log provider, operation, response status, latency and correlation identifiers without recording secrets or unnecessary personal data. Keep upstream errors distinguishable from gateway errors, and monitor authentication failures, throttling and timeouts separately. These signals help operators tell a bad credential from an unavailable source or an integration defect.
Plan for change before launch
Pin and monitor API versions, review provider notices and test changes in available test environments. HMRC’s Developer Hub provides documentation and sandbox testing; its production base is https://api.service.hmrc.gov.uk and its sandbox base is https://test-api.service.hmrc.gov.uk. HMRC also uses media types in the Accept header for API version selection and requires HTTPS with TLS 1.2 or higher. HMRC Developer Hub; HMRC reference guide
How to evaluate GovBridge or build a similar system
The right evaluation is not whether one URL can reach four agencies; it is whether the gateway makes each integration safer and easier to operate without obscuring its constraints. Ask for concrete answers to these questions:
- Which exact endpoints and operations are supported for each provider, and which are out of scope?
- What user consent, application credentials, subscriptions, scopes, keys or Business Gateway arrangements does each operation require?
- How are source-specific identifiers, schemas, errors and provenance preserved in the gateway response?
- How are each provider’s rate limits enforced, including 429 responses and concurrent calls?
- What retry, timeout, caching and outage behaviours apply, and how are potentially non-repeatable submissions protected?
- How are credentials stored and rotated, and how are access decisions and failures audited without exposing sensitive data?
- Which sandbox or test environment covers each integration, and how are upstream version changes monitored?
These questions distinguish a genuine integration layer from a thin proxy that merely forwards requests. The title identifies GovBridge as a unified gateway, but project-specific details such as its endpoint coverage, security controls, performance and operational history are not established by official provider sources.
Finding the right government API and checking access
The UK API Catalogue can help locate public-sector services, and GDS API standards offer guidance for consistent API design and operation. Neither catalogue inclusion nor a gateway architecture means an API is openly accessible: the access model, licence, terms and onboarding conditions have to be checked for the individual service. UK API Catalogue; GDS API technical and data standards
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