Hi Andy,
I spent quite a bit of time trying to find more info out about Kentucky organs, there doesn't seem to be information recorded about them - all my attempts lead me back to one company, Sydney S Bird of Poole in Dorset.
According to the info I have picked up the story goes something like this ....
Ole Sydney Bird was a forward-thinking chap in his day, and it is believed he had connections with John Logie Baird, inventor of the television, it is also held that Bird helped Baird establish the Baird Television Company.
Sometime before the outbreak of WWII, Bird wanted to get into the 'Toy' making business but back then Toy manufacturing in this country required a government licence to do so ... to save time Bird simply 'bought' into the toy business by acquiring two companies already established as toy manufacturers ... this was around 1932 and the companies were Prestico and Morthan (no, not MoreThan Insurance

)

Prestico, made 'meccano' like construction kits that required no nuts and bolts, every piece just clipped together (maybe Peter's Kentucky frames started life here

), and Morthan made scaled down sewing machines, cookers and washing machines that operated by batteries.
After the war Bird acquired more companies, Airspace Radio Condensers of Tring was one of the firms targeted by Bird's growing empire ... this enabled him to design and manufacture the 'turret-tuner' which enabled the old BBC-only TVs to be converted to receive the then new independent TV channels, it was demand for this product that led to Bird relocating to Fleets Lane, Poole, in 1953 ... up until this point Sydney S Bird was located on the A10 Cambridge Road, Enfield.

By 1957, Bird was the Poole's largest single employer of labour, having some 1,000 people on its staff. A chap by the name of Richards was in charge of sales of all 'Cyldon' electrical products manufactured at the Bird factory - this included the famous 'Cyldon' door chimes later known as the Morphy-Richards Cyldon.
Other products produced by the company included cine reels up to 35mm and recording spools. All toys were sold under the "Vulcan" trade mark. Sydney S Bird became a public company, and about 1962 the company merged to become Astaron-Bird, a holding company comprising three firms: Sydney S Bird, Astaron Electronics and Morthan Ltd.
By the early 1960's the Bird organ was on the table at Sydney Bird and around 1964 they launched a new range of amplifiers and two new organs, one was futuristic and for professionals, the other for home use, called somewhat unimaginatively the 'Home Bird'.
Astaron Electronics concentrated on a new radar, called Raymarc, and echo sounders which were being fitted to trawlers and ships all over the word. Secret government work was also part of its remit.
From what I can gather at some stage during the late 1960's Ken Tuck joined the Bird company during which time the entire group was acquired by Brocks early in the 70's. The Kentucky Organ Company seemed to rise from break-up of the Sydney Bird emplre, but I can't be sure about that as the trail goes cold about the time Brocks took over ....
Maybe there is more to be uncovered in the future - who knows
Mike