Hi mate. I have a mid section and back box from my old HR. Car only did 18,000 miles before it was removed, however it is still from a 2007 car so has seen wet weather. I know one or two of the bolts joining the sections had rusted and snapped when it was removed so I guess these will need hammering or drilling out but I can sell it to you if you're interested. Let me know and i'll drag it out the garage for some photos if you want it.
I'm in Cheshunt, Herts