Sunbeam trolleybuses had been built at Sunbeam's Moorfields Works, enabling Guy to concentrate on motorbuses and lorries at their Fallings Park Works, but in 1953 they completed the construction of new assembly shops next to their existing works, and Moorfields Works was closed, with trolleybus production moving to Fallings Park. Guy continued to update their old models, introducing a new version of the Otter chassis in 1950 for 30-seater vehicles and 84 were ordered by London Transport. By 1954, Guy passenger vehicles were operated by 150 companies in the UK and in 26 countries abroad. The company developed the first two-axle double-deck trolleybus chassis in 1954, the Sunbeam F4A, which could seat 68 passengers.