Here's a update on that f ing rattle. I took off the gear knob, then prised the rubber selector off wi a big straight head screwdriver, found that i bent the wee pin which looks like a flint from a hornby rail track, then noticed the cable for selecting reverse has a square metal head on it and when the pin is in place and reverse is selected this cable comes up a groove in the gear selector and tilts at an angle, so i drove round the block and this block vibrates in the groove. So i reassembled the lot and found it rattles a lot more on lower speed and less at 50-60, so in a couple of days im going to try a few things to solve the vibration.
I'll keep you up to date.
thanks for your help.