Training/Obedience classes in Beds/Bucks

I posted this in Behaviour but thought it might be better here?
Anyone know of a decent trainer in Leighton/ Milton Keynes kind of area?
I've just decided to stop going to my current group (losing 3 weeks money) as, although she has a very positive attitude towards the dogs, she is blunt to the point of rudeness and critical when it comes to the owners. Not fun, not helpful.

I'd really like a nice group that I can look forward to going to and learn, not one where I feel like if I've had a bad week and not practised too much I'm going to get sworn at and told off!

Thanks