In reply to tonanf:
It has been a while, but you can just search for events online and turn up. They are really well organised, fantastic fun and most events cater for complete novices. The great thing is that the 'elite' people will be competing through the same territory, so there is a real buzz about being involved. Organisers are very helpful and plenty of people around to offer guidance. On novice courses, little kids will be charging about, some with parents in tow... There are basic rules about what to wear.