Thanks Mike. Clearly we're thinking the dame way as I bought them primarily for the brackets which I kinda like. Plan is to mount another light in place of the original. However, I thought maybe I'd take a look at how they are but in closer inspection it seems amazing they are constructed as they are, esorcismi considering their cost originally!
If they're glued maybe I can get them into the oven (not the kitchen oven, a proper controlled oven) I can see if I can persuade the two halves apart. Not sure why I'm bothering but it seems maddening to be beaten so easily!
Thanks