To advise CM of Belfast about untraceable smells, it might be useful to add the possibility of his picking up a plastic bag on his exhaust pipe, as it stinks to high heaven. When it happened to me - on a Sunday with in-laws in the back - the only place open (Kwikfit) put the car on the ramp and scraped it off in five minutes without charge. Needless to say I looked after the lads.