In 1935, encouraged by the chassis builder, a Commercial Motor Show exhibit was built on an AEC Regent I chassis for Leeds Corporation, this bus had a rakish streamlined outline and a full-width cab but more importantly had an all-new steel framework patented by the company, Roe and Bramham (who became a director that year) and a 'Safety Staircase' patented by the company, Roe, Bramham and William Vane Moreland, the general manager of Leeds City Transport. This staircase on a rear platform bus gave less loss of seating capacity than the straight staircase favoured in London and Birmingham but intruded less onto the boarding platform than the normal semi-spiral arrangement whilst being superior to either layout in having two broad landings allowing boarding and alighting passengers to pass on the staircase. It became a standard feature of all subsequent peacetime Roe double-deck bodies for Leeds Corporation and was widely employed by other fleets, 777 examples being built by Roe prior to expiry of the patent in 1950.