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transport.data.gov.uk

Transport-related linked data from data.gov.uk. Namespace for roads Namespace for stations Namespace for airports Road traffic statistics (SCOVO)
business.data.gov.uk

Business-related data from data.gov.uk: Namespace for companies; this appears to have entries for all companies registered at Companies House. Part of package:data-gov-uk.

You can also access this registry using the API (see API Docs).