Recruiter / Sourcer to find a UK telemarketer

I'm looking for a recruiter or sourcing specialist to find and screen candidates for me — not to do the calling themselves. The role you'd be sourcing for: one UK-based, native-English telemarketer /... (Budget: £250 - £750 GBP, Jobs: Appointment Setting, Human Resources, Interviewing, Lead Generation, Market Research, Sales, Sourcing, Talent Acquisition, Telemarketing, Telephone Handling)