In reply to LakeDistrictMountaineer:
Chris Ensoll and Stuart Carter.
Both will run an excellent course. I've been on training courses involving both (although not recently) and found them to be friendly, knowledgeable, and professional.
Travelling to North Wales will have the advantage of opening up new areas to you, and may test your skills further. So worth considering providers in that area too. North Wales isn't just pyb either.
Hope that's helpful