text: This evolution was eventually not limited to luxury motoring. The entrepreneur Noel Mobbs laid the foundation of the volume sunroof market when he evolved his coach building business into a company dedicated to the manufacture of sliding roofs in the name of Pytchley. The Pytchley mechanism was both patented and first publicly demonstrated in 1925. At first Pytchley used their sliding roof system to build a number of coach-built, custom "tourer saloon" automobiles sold from their premises at 201 - 203 Great Portland Street London. In 1927 they claimed for a Daimler 20/70 hp that "This roof slides at the touch of a finger and opens up 50% of the roof area giving greater visibility and more air without draughts." The sliding roof system evolved from a device that Pytchley installed themselves, to an option which manufacturers offered as a standard body style. It was factory fitted to vehicles from a number of different manufacturers. By 1929 the design had improved so that when closed the moveable panel was flush with the rest of the roof. Morris built several models using Pytchley's technology from 1932, including the Morris Minor, Morris Major and Morris Ten adding what became known as a Sliding Head (using the term head in the same way as Folding Head or Drop Head). This comprised a panel which could be slid back over the roof behind to create an opening above the driver and passenger. The sliding panel also incorporated locks which allowed the panel to be fixed at any position from fully closed to fully open. By 1935 Wolseley were using the Pytchley roof and by 1936 Austin too were also selling models with the sliding head. The Hillman Minx was another low-cost small car which was clearly not designed to be chauffeured, and in 1931 it was offered in a variety of body styles as was usual at that time, among the options was a sliding roof section including, on the 1933 Aero model with glass panels, as photographed on the 1932 show car, making this the first moonroof. In 1941 Pytchley took on the manufacturer Vauxhall for failure to pay royalties. Vauxhall claimed that their variation of the sliding roof, which slid the panel under the rear section rather than over, was sufficiently different to mean that a license need not be paid. Pytchley won the case.