http://www.cs4fn.org/ - an interesting site from Queen Mary College, London - try http://www.sodarace.net
http://mmp.maths.org - millennium maths project site from Cambridge University - try their magazine pages http://plus.maths.org/
http://www.rigb.org/contentControl?action=detail§ion=rt&rt=55 - games hosted by Royal Institution
http://www.glam.ac.uk/maths - follow link to find out about Glamorgan University's exciting programme of Maths Masterclasses for KS3 and KS4 students
http://www.bangor.ac.uk/~mas009/pcont.htm - links to work by the late Dr Jan Abbas, a Bangor mathematician.
http://www.bangor.ac.uk/~mas010/publar.html - from site of Professor Ronnie Brown, Bangor - this page is entitled 'popularisation and teaching' and has lots of interesting links
http://www.mathcomp.leeds.ac.uk/Home.htm - site of UK Maths Challenge, Leeds University for those who really want to test themselves
http://www-history.mcs.st-andrews.ac.uk/history/ - site of Mathematical Biographies, St Andrews University
http://mathworld.wolfram.com/ - a site to explore to find out about advanced mathematics
http://www.mathscareers.org.uk/ - organised by the Council for Mathematical Sciences
http://www.futuremorph.org - wake up to your future with science and maths
http://www.youtube.com/watch?v=sh7Gj0uFO1w - More Maths Grads 'My Dream Job' mpeg in Welsh made in collaboration with schools in North Wales