Non-metallic building materials; windows and window frames; double glazing; posts and panels; timber (other than unsawn timber); lintels, fencing and trellis, all being non-metallic; walling panels of wood; hardboard, plywood, hardwood panelling for use in building; doors made from moulded or pressed wood, chipboard or from wood fibre; non-metallic shower stalls; rainwater pipes, soil pipes, gutters, all made from plastics; flooring tiles, walling tiles, all made of ceramics or of plastics; non-metallic roofing sheeting being bitumen based; ruberoid mastics for use in building; swimming pools; conservatories; sheds; parts and fittings for all the aforesaid goods; paving, bricks, blocks, glass, plasterboard