Gentlemen,
My friend who owns the beam engine in the thread has found some information about the company, see below.
Just quick update on Beam Andy.
Adaptors (engineering) Ltd of 94-110 Tower Hamlets Road day job seems to have been making hydraulic hose fittings and they had a little mascot on their company note paper called "Andy Adaptor". Why they went into model engineering in the late 1970's, I have no idea but the result was Beam Andy, the grasshopper steam engine and Hot Andy a hot air engine.
They also had a crack at selling home computers – setting up a computer division "when they found one of their employees was interested in computers" according to a 1983 article in Personal Computer News, so seem to have been a pretty enterprising lot.
Not long after this, the London site was redeveloped and company moved to Salisbury. I can find no more save that it was dissolved at some point after 1991.
Finding this sort of thing out pleases me and I hope is of some interest to you!