Preferred supplier list of recruitment agencies - General Roles

We would like to create a preferred list of three suppliers to service our recruitment needs for our General recruitment needs.GMC roles (except for IS) - agencies who will provide support where needed for the permanent recruitment of, and the supply of temporary workers where required in, all roles in all of the following areas;? Administration, contact centre and face to face customer service? Human Resources? Finance? Facilities? Procurement? Policy? Legal? Governance? Business Planning? Quality Assurance? MPTS