reed.co.uk
Extensive listing of UK opportunities. Also includes separate listings for Ireland with limited European and International opportunities.

totaljobs.com
Large listing of jobs almost entirely in the UK. Includes section to track applications, store CVs and set up jobs by email.

Monster.co.uk
Includes separate listings of UK and European jobs plus a very large database of international positions. Part of Monster.com, the leading global online network for careers.

Jobsite
Extensive list of UK and European jobs. Receive targeted jobs by email and send your CV to recruitment agencies.

JobsGoPublic.com
Dedicated to government and public sector jobs. Complete listings including government, charities, fire, health, police, and social programs.