Right-ho.. The car has suffered from interior creaks in the back for as long as I can remember. I'm sure I'm not alone in this....

So yesterday I put on my problem solving hat and went at it proper!

Rear seats in, rear seats out, parcel shelf out, back in again, side panels off and on, worked it out eventually after a good hour or so.
Where the interior side panels (3 door) fit onto the window edge there are 3 clips and 3 "feet" the panel rests on. Noticed with a closer look one of these feet had left a bit of a rub mark on the bodywork metal. Applied a smear of grease to it and TA-DA annoying creak is gone! Now I know what it is I just got to repeat for the other side.
Sorted. Hope this helps someone else too
