Hi Matt
My Clubman had a squeak coming from the rear too. I got my 15 year old son to sit in the back while I test drove it and we soon noticed the noise disappeared when he sat in the o/s/r seat.
on closer inspection, the noise comes from where the seat back sits against the body.
I dont think its the seat catch, as i lubed that.
Got rid of sqeak by putting small piece of card between seat back and body(temp repair til I can find time to take it to Mini!!) Hope this helps
