Thanks Hugh and Geo.
And at last - some pics!
A small rectangle of thin plastic card was slipped between the forward PE hinge and the upper wing PE plate, which has sorted the problem. It also now looks more like the real assembly, as the PE parts are, by their very nature, flat, and didn't really replicate the rather substantial brackets of the real thing.
Hydraulic rams have also been added, made from short lengths of plastic rod, some wiring is in place, and the whole lot painted, apart from picking out some details.
The landing gear doors have been fitted, and hinges added from stretched sprue, the retract struts have been fitted to the main gear, and spring linkages added from sprue, and the IFF dipole fitted below the starboard centre section, again from stretched sprue.
My hands are too stiff to tackle the detail painting and other 'fiddly bits' at the moment, but I hope to attend to this within the next day or two. Meanwhile, the Tempest drop tanks need some minor modification, which is the next job.
Here's what the model looks like so far.