lol, yea ive checked the panel and no probs there. Its definately (but i will re-check the seat latch as my mate is on the daft side sometimes lol) the driver side back door (had one of my mates listening while i was driving down the road). Trying to speak to the previous owner to find out if the door has even been changed or the bolts been loosened and re tightened at some point but cant see any wear on the bolts.
Its one of them strange but annoying problems that seems worse when car is cold.