Find a Gap (http://www.findagap.com/)
findaGap.com offers a comprehensive gap year directory of gap year ideas, gap year travel destinations, gap year jobs, gap year placements and expeditions, backpacking information & much more

Gap Year Directory (http://www.gapyeardirectory.co.uk/)
Everything you need to plan your year out. Find flights, book rail passes, buy travel gear and search info on over 300 gap year programmes worldwide

Google: Gap Years (http://directory.google.com/Top/Regional/Europe/United_Kingdom/Education/Gap_Years/)
The Google directory on Gap Years

Travel Tree (http://www.traveltree.co.uk)
Looking to grow? Search Travel Tree for volunteer work overseas, gap year programs, language schools, adventure holidays, international internships, career breaks, study abroad programs, jobs and much more