Buy car. All fine (apart from airbag light now sorted). Take wheels off over winter to clean underside but otherwise don’t touch anything. Drive car off in spring. Clunk clunk clunk seemingly everywhere (I know sound travels). Seems to be bump related. Come home. Tighten up when nuts to 130nm. Seems to do the trick. Take car to Cotswold bmw to replace the rear spring and oil change. They can’t see anything wrong with suspension and say it’s pass-worthy. Come back home - noise again getting worse and clunking is irregular but frequent. If it was a dead smooth road then it might not make the noise. Tighten wheel nuts to 130 nm. No difference. Replace wheels with originals. No difference. It’s not diff related as it’s not linked to take up of drive. Could it be engine mounts at 31000 miles. And how does that manifest itself. Before I take it somewhere to fault find any sensible advice please? Otherwise car is superb. But currently undriveable due to the noises. Thank you