Many thanks for all of your replies.
I think I will be contacting Old Sarum in the near future to have a chat with them. It certainly seems a good option.
FFF, I take your point about trying to teach tailwheel without much experience on them. That was why I was looking at doing the course on a tailwheel aircraft, the more experience the better! I figured it would be easier to do the course on taildraggers and then instruct on tricycle gear when necessary, than vice-versa.