B95 engine numbers have the unique prefix 'SMTB', while B105 engines are prefixed 'SMUA'. The prototype car was SE492 chassis number 638, which was modified to add bracing to withstand the extra power and weight of the four-stroke engine, a taller bonnet (US hood) with large grille to accommodate the engine, and unfaired headlights. In mid-February 1959 this car spent two weeks at the Royal Enfield factory, during which time it covered of general road use and of endurance testing at MIRA. By the time of the press release announcing the launch of the B95 in March 1959, a further of road and track tests had also been carried out by Berkeley factory drivers. Perhaps to address the reputation for breaking down that the two-strokes had developed, especially in export markets, it was emphasised by the factory that during this testing there had been no involuntary stops or any form of mechanical failure, and that further testing would be performed until a total of had been completed. At its launch, the B95 cost £659 (equivalent to £ today). Chassis numbers followed on from the SE492 series, and chassis number 670 (the earliest known B95) was registered at the end of March 1959. The first B105, chassis number 686, was delivered about one month later. Series production continued to chassis number 835. A separate batch of about 12 cars (chassis numbers 850 to 861) appear to have been made for Mantles Garage in the summer of 1960, which used some chassis parts and the bucket seats of the T60. About 178 B95 and B105 models were made in total, of which approximately 15 to 20 cars were sold to export markets. QB95 and QB105 In October 1959 the Q range was announced, with longer and wider bodies the same dimensions as the Foursome. The wheelbase went up from to and the track from to . The Qs were four seaters (just), although the QB version dispensed with the rear seat to give extra luggage space. The only 'official' mention comes from the Autocar magazine's Motor Show edition of October 1959, when it appears that Berkeley's stand featured a red soft-top QB95 and a blue QB105 with a black hard-top. From this single reference it is assumed that Berkeley built at least two models of this series, although none are thought to have survived. T60 Surprisingly late-on in the British microcar boom