Modular portable building units of non-metallic materials for construction into relocatable buildings; modular prefabricated building units of non-metallic materials for the construction of buildings; modular structural units, not of metal, for the construction of prefabricated buildings; non-metallic buildings; non-metallic buildings (sheds); portable buildings made of non-metallic materials; prefabricated non-metallic buildings; prefabricated relocatable buildings (non-metallic) constructed in modular units; mobile accommodation (non-metallic); non-metallic transportable accommodation; mobile homes (portable buildings) of non-metallic materials; non-metallic prefabricated building elements for sale in kit form; homes and accommodation provided in kit form, including in flat-pack form; mobile accommodation for workers; transportable, mobile and temporary homes or accommodationA, predominantly made of non-metallic components but which may include a wholly or partially metallic frame