• Media Guardian (buy print newspaper on a Monday)
• Civil Service (Communications roles)
• Creative Pool Agency
• Purple Recruitment Consultancy
• Formula Won Media Recruitment
• The Blueprint (Digital Recruitment)
• Brand Republic
• Job Rapido
• Planet Recruit
• Chinwag Jobs
• Profiles Creative
• Reed Agencies
• Careersandjobsuk
• The IT Job Board
• Pure Genie (online travel jobs)
• Amazon.co.uk (specific vacancies)

There are only a couple of places that I know of that Universities advertise in. Looking on the websites of specific universities you are interested in always works:

• Guardian (Education)
• Jobs.ac.uk
• THES Jobs