there is a group of people that live in horsham who i have trained with before and they've got some videos on youtube, their called the Horsham Movement so you could always try and contact them through youtube. I live in maidenbower though and am only 16 so don't normally train in horsham.
westsussexparkour.freeforums.biz/forum.htm basically, i created a site for west sussex freerunners, tirckers etc, seeing as there wasnt a specific one. invite people you know to it and i'll do the same, and hopefully i can get it to expand and we can sort a real freerun community out! check it