RE: Mansfield Classic
Mansfield is usually the week or 2 weeks before the brits - check the sticky once I have the new beef issue.
In the juniors - same weight shredded will do the trick!
Personally I would wait till you are 18 till you compete - a lot of juiniors are 20 nearly 21 and have 5 years training under their belts!
best thing is go and look at a show and see the quality in your class.