[3] By 1927, the fleet had increased to five vehicles, including a rather unusual 6-wheeled Rolls Royce with seating for 20,[4] and the company had taken over a building at Porton Camp.

In 1939 Silver Star acquired its first double decker vehicles, with six second hand Leyland Titan TD1s being purchased from the Yorkshire Woollen District Transport Company.

[6] The 1950s saw a significant expansion of weekend forces' leave services, with Silver Star vehicles travelling as far afield as Scotland and South Wales.

In 1957, Silver Star were granted a licence for a new express service from the Bemerton Heath housing estate in Salisbury to Porton Down, leading to the purchase of three new one-man operated single deck buses.

[10] They retained and used some of the ex-Silver Star vehicles for several years afterwards,[2] but many were quickly passed on to other fleets including Bristol Omnibus and Western National.