The prototypes had 80-seat bodies by Eastern Coach Works (ECW) and entered service with Central SMT and Bristol Omnibus Company.
ðə pɹˈoʊɾoʊtˌaɪps hæd ˈeɪɾisˈiːt bˈɑːdiz baɪ ˈiːstɚn kˈoʊtʃ wˈɜːks ˌiːsˌiːdˈʌbəljˌuː ænd ˈɛntɚd sˈɜːvɪs wɪð sˈɛntɹəl ˌɛsˌɛmtˈiː ænd bɹˈɪstəl ˈɑːmnɪbəs kˈʌmpəni.