geoffwoz

Thanks so much for getting back to me, I forgot to mention that I did have a look in the workshop manual, and there appear to be nuts inside the headliner for the two roof carrier attachment points, but nothing that I could see obviously for the clips (although I didn't properly remove the headliner. I just looked sideways from the gap where the sunroof goes.

The other attachments appear to just be flush with the roof ??? From what the service manual says the rail should just be able to be lifted up from the clips, so my guess is that the bodge job that the first repairer did with glueing down (probably because they broke the clips and didn't want to pay for new ones, even though the respray was a subaru warranty repair). Attached is the part of the service manual that seems relevant. 

I'm thinking that really it probably looks like I just have to lift it, so careful application of the prising tools and some heat I guess is my best shot, and keep my fingers crossed :-)

Thanks so much for getting back to me.