The list of companies DWP has contracts with for the provision of mail services is as follows:
Royal Mail Group: postal services (this is UK-wide via an agreed memorandum of understanding)
TNT: Internal courier services (this is a cross Government courier contract let by DWP)
UK Mail: Down Stream Access provision for second class output from DWP’s regional delivery centres to customers. (This is a framework contract let by Office of Government Commerce Buying Solutions.)
Spring Global Mail: International Mail (this is a DWP let contract)
Hays DX: Document Exchange service for DWP Solicitors, Debt Management and Compensation Recovery Unit (DWP access this via an HMRC let contract).