section comprises an upper cladding panel 51 and a plurality of lower resilient covering panels 52 the cladding panel 51 is continuous along the length of the side wall and extends from a top edge 53 at the window opening to hinge 54 a at a bottom edge 54 at a position just below the top edge 33 of the sheer plate 32 the top edge 53 is located underneath an edge of the window frame structure and this aspect is described in detail in one of the above co pending applications the disclosure of which is incorporated herein by reference the cladding panel 51 is formed by pultrusion from a fibre reinforced resin material and thus defines a relatively thin sheet 55 on an inside surface of the sheet is carried a layer 56 of an insulation material and this insulation material is bonded by an elastomeric adhesive to the inside surface so as to be carried thereby an elastomeric adhesive takes up any relative movement due to differences in coefficient of thermal expansion between the pultrusion and the insulation material at the lower end the panel 51 includes a mounting flange 57 the mounting flange has a first part cylindrical portion 58 commencing at the bottom of the insulation 56 and extending therefrom toward.