I seem to remember Beagle's 'cunning plan' was that Bullfinches would be built for the private market to mop up spare factory capacity from building Bulldogs. The private owners were supposed to order and then wait some undisclosed period until it was convienent for Beagle to build one....
It has to be said most of what Beagle did was pretty daft, the end result of years of 'cost plus' work for the military and then an intention to produce British Executive aircraft. Somewhat like designing the Pup/Bulldog to be composite and have lovely curves and then building it in alloy.
As for the Terrier and Airedale stories, you do have to wonder what they were drinking in the boardroom.
But nice aeroplane - inevitably doomed to be a 'one off'.