http://www.biketrialuk.co.uk/ Depends how good you are regarding what class you eneter...it's best to start off low i guess you'd probably be better off going to one to watch first, checking out how hard the routes are, then trying it yourself so you can get a rough idea of what level you're riding at relative to the other people at the events...... For a lot of them you need a membership ( annual membership @ £10 a year ) and i think it's an acu card...dont hold me on that though as im not entirely sure ...... Hope ive been of some help!