For information about this calculator see the British Vintage Calculator site at - http://www.vintagecalculators.com/html/radionic.html

The very helpful Nigel Tout from the Vintage Calculator Web Museum www.vintagecalculators.com emails to say ‘Clive Sinclair had a deserved reputation of being a very innovative entrepreneur, but by the end of 1976 Sinclair Radionics was in financial difficulties. The British government's National Enterprise Board (NEB) bought heavily into Sinclair Radionics, and was especially interested in the flat screen television which might rejuvenate the ailing UK television industry. However, the financial situation got no better. The NEB gave further heavy financial help but was under pressure not to lose the taxpayer's money, so they tried to raise money by selling off assets. The calculators were no longer profitable, so in 1979 the rights to the Radionics name, together with parts and dies, was sold to the ESL Bristol group of companies under the name Radionics Products Ltd. The NEB also sold the television business to Binatone, but retained the Sinclair instruments division which was later taken over and became Thandar. This Radionic model is very similar to the Sinclair Oxford 150 (http://vintagecalculators.com/html/oxford_150.html) from a few years earlier. The Radionic in my collection actually has a Sinclair sticker on it – see lower photograph on the page http://vintagecalculators.com/html/radionic.html. The Sinclair name still had a lot of prestige to it, and would for some years to come when the Sinclair computers were very popular. So I think that we can be confident that the Radionic is a Sinclair design, or at least derived from one (it is possible that the electronics inside may have been updated)’.