Dr Moulton and Andrew Ritchie actually met when the Brompton was in the first stages of design in Andrew's flat but Alex left without taking up an option to assist with manufacturing. Its all in the Brompton bicycle book written by David Henshaw.
I own two Moultons a recent TSR2 (20" wheeled) and a 70s Raleigh Moulton Mk3 (16" wheeled). I also own a Brompton. For me the perfect bike would be the 16" wheeled Brompton/Moulton hybrid that folded like the Brompton but had suspension back and front.
I have attended one of the Moulton BOA events and as you say the house and grounds are stunning. I hope to visit the Brompton factory soon but that may never happen
Regards
Jerry