Hi all, i seem to have a very annoying rattle or knock coming from either the hand brake or double passenger seat. Only when reversing off my drive and accelerating, occasionally over bumps. It sounds like metal on metal, almost like a coin has been dropped and rolls back and forth hitting something. I have taken the seat plastics off the driver side to rule that out. I know its pretty tricky to diagnose but does anyone have an idea idea what could cause this or has had something similar, it drives me nuts !!