I apologise for only noticing this thread nearly three years after it started, but for my 2p worth, Lambert Aircraft are great guys to do business with.
Sadly, I have not bought one of their aircraft, even though the M106 is almost certainly the cutest "toy" airplane of its type - I still secretly plan to get one. Like many similar aviation businesses they also do mainstream commercial work which they freely admit is far more profitable - that's how I know them - but they still prefer doing the fun stuff.
I agree that their web site updates don't seem to be much of a priority - "Events" seems to end in 2007, although I can assure you they were exhibiting at Aero Expo in 2009! You could try just phoning them - since they are Cranfield graduates you will find their English is impeccable.