The body structure is comprised of welded wide aluminium extrusions, stiffness being provided by a deep keel in the centre of the roof. This method of construction gives a body shell which is both light and strong. The large windows are bonded to the structure in a manner similar to many car windscreens, so giving a light and pleasant interior. The seats are of the tip-up ‘cinema’’ type. They are cantilevered from the body-side to ensure that there are no litter traps which would make cleaning the vehicle difficult. Units are air-conditioned throughout by two roof-mounted air-conditioning units fitted to each passenger module, as well as one in each cab.