An A-Z list of all suppliers with an agreement with OGCbuying.solutions is available at:
http://online.ogcbuyingsolutions.gov.uk/suppliers/index.html
Information relating to suppliers used by other Government Departments is not held centrally.
Government Departments are responsible for their own purchasing decisions which will be based on value for money and usually achieved through competition.
They are encouraged to use existing collaborative procurement deals, where they provide value for money, such as those offered by the Catalist Framework.