Derby Dog Training Club
I used to train there (but not in the puppy class, so I dont have first hand experience of that class). I think they train at Chellaston, just off the A50? The only reason I dont train there at the moment is because I moved out of area.
They are KC registered, and use positive reward based methods (dont think they use clickers though?) The trainers are friendly and approachable. There are members of the club that compete, and they hold an open obedience show each year.
I can PM you their contact details if you are interested?