Miller must have had a bit of influence, or good timing, with electronic tone generation instruments.
His parallel business activity of custom keyboard instruments was well connected. The links have information from archived documents that only became available this decade:
https://books.google.com.au/books?id...ent%22&f=false
https://books.google.com.au/books?id...ler%22&f=false
At that time (circa 1957), a nice Selmer electronic organ retailed for 535 guinea, so a 3,000 quid instrument sale in to a growing market (albeit about to get swept away by transistors) would have kept Mr Miller interested no doubt.
A recent PHD thesis gives a wide view of that era of electronic music interest - perhaps something in there for everyone:
http://etheses.dur.ac.uk/3915/1/Nico...012.pdf?DDD23+