Rover/Back Box/ Heat Shield.

Maybe it has been fitted incorrectly, or if it is a pattern one, the supports, (brackets, welded rods etc) may be bent wrong or slightly in the wrong place. In any case, it should be possible to increase the clearance, if it's actually hitting the heat shield. Either by resetting the pipe runs, bending the supports, or as a last resort, making them longer by welding. I've used all the above methods to cure similar problems on different cars in the past. Mike.

Thanks Mike, Seems like a garage job as it needs to be up on ramps. Thought of wedging a piece of old tyre between the back box and heat shield to stop it, then thought this may not be safe due to the heat. Peter.