in a fore aft direction in a vertical chordwise plane an upper strut 106 is pin joined to the upper shroud panel 60 at the bore 84 and extends to the bore 56 of the double pivot mount 54 it will be noted that the strut 106 extends in a vertical spanwise plane as shown in fig3 in use each of the pivoting butt straps 86 can pivot about either attachment in order to allow relative deformation under thermal or mechanical stresses between the skin overhang 28 and the shroud panel 60 the degree of permitted relative deformation is determined in part by the geometry of the shoulder 90 the central strap 102 ensures that spanwise load can be taken by the structure without significant relative movement between the panels for example should a change in temperature cause the shroud panel to expand in a spanwise direction by a degree greater than the skin overhang this will be permitted by outward pivoting of the shroud side of the pivotable butt straps away from the central butt strap the assembly as described above provides a stable structure for the reaction of the various forces experienced in flight the ribs are arranged to support the shroud panels vertically via the upper struts whilst the panels support the ribs in a spanwise lateral sense though the struts this functionality arises because the struts are angled in the vertical spanwise plane and in compression have both a vertical and horizontal spanwise load carry capacity variations of the above embodiment fall within the scope of the present invention.