There was one at Leziate, never been myself..past King's Lynn somewhere
There is one at Upwell Hall..again no idea if its any good but you could go and watch first I suppose
not sure if this is still the number Maxine Munday on 01945 880975
There's one other side of Peterborough , they do the line up thing and get you to run around and do triangles..havn't ever seen anyone giving out advice but they may be because the people that go already know their stuff.
http://www.freewebs.com/wdts/trainingclasses.htmThen there is this one .
http://fivejays.piczo.com/training?cr=5&linkvar=000044. don't know what their ringcraft is like but I enjoyed their obedience and agility classes....
If they are all to far away they may be able to point you in the right direction.....good luck