As far as I know, JoMorRo and Lystonia were different companies, although there were connections between them.
1) JoMoRo has been founded by three members of Alan Mann Racing, Jim Rose, Jim Morgan and Rod Manester in 1970. The JoMoRo-factory was situated in Alton, Hampshire. 55 perfectly designed and engineered cars, sized 2 thirds the scale of a period F1, were built. A fire destroyed the Alton-factory and all the moulds for building the cars
2) Lystonia: After the Alton-factory-fire Rod Manester and Jim Morgan set up a new company called Lystonia in Angmering, West Sussex, to build bigger cars -for +10 children- nearly the size of contemporary Formula Ford racers. Only 14 cars were built