The Barnes & Mullins Skiffle-jo

I have a friend who has a great urge to reacquire one of the guitars he used to own in his youth. He recalls they were invented, and sold, by Art Nash, who used to run a music shop in Croydon Road, Penge, London SE20. He described it as a banjo neck on a round guitar body, named a Skiffle-jo. He was reminded of it by that advert "You can switch on your hot water while embarrassing your daughter..." where the narrator plays a round-bodied acoustic guitar, though the body is a lot larger than on the Skiffle-jo. Anyone seen one recently, or even got one for sale? I found a couple of photos on Google Images, and they were actually built by Barnes & Mullins in the late 1950s. B& M made banjoes anyway so this was probably a cheap way to cash in on the skiffle craze. According to one commentator, they do sound quite like a banjo despite the wooden top.
More info welcome! Help make an old man (well, older than me) very happy.

Grahame