At the beginning of 1967, all was not well. The company that had held a controlling interest in “Jennings Musical Industries” since early 1963 – Royston Industries – was on the slide. Its black box flight recorder, the “Midas”, had failed to capture the market. As “The Observer” newspaper noted in 1964, the fortunes of members of the Royston Group – Burndept Electronics, Jennings, Vidor Batteries, and so on – depended on its success….https://www.voxac100.org.uk/tom_jennings_1967_1968.htm