Parliamentary questions (PQs) are the mechanism by which MPs can ask questions of other MPs/Government departments on behalf of their constituents or according to their own political agendas. Each government department has their own Parliamentary Branch, which manages the distribution, tracking and answering of PQs.
OLCS (Operator Licensing and Compliance System) is an interface that allows DVSA staff to administer the licences and compliance of commercial vehicle operators. The operator facing service is called Vehicle Operator Licensing.
This is what the operator sees when on a webchat, or call, or processing an email enquiry using the proposed system (ie. fairly vanilla Salesforce UI at this point, not customised as yet - project is alpha).