[LeRich]

Your best bet is turning a blind eye even if the situation is frustrating. If they are causing substantial noise disturbance or creating environmental pollution you can report the neighbours to Environmental Health, but I doubt they'll be interested.

I suspect the Jetta has had something done with its wastegate - there's a trend amongst chavvy VAG car drivers to tune their TDIs so they sound like a broken old trains, and smoke like one. There's a few like that knocking around Crewe.