Hi  
I've been riding road bikes for many years and have also been green laning for quiet a few too. I am looking to have a go at Trials riding but dont have a clue where to start, so thought this would be a good starting point.  
I am looking to do this just for pleasure and am not really looking to enter loads of competion events, although a few events a year would be fun, so my questions are:  
Being a bit of a big lump (16st) what would be a good starter bike that will be fairly reliable and not cost the earth e.g 125, 250 ? 4T, 2T, any sugested models to look for ?  
Are there any schools in the UK that run courses that can teach me the basics of machine control, and technique ?  
Are there any good riding areas in the Herts/Beds area that people can recommend for practise ?  
Is there a good club in the same area that would be happy to help a novice like me ?  
Thanks in advance.  
Simon