So my mechanic has just replaced both manifolds on 3.0 V6 RR Sport 2010. Starts her up and there’s a diesel mist / smoke smell coming from the back of engine at the top. Any ideas as can’t see enough from top or from underneath ??

Hi there, you should have put this in the range rover section.
Injector coppers seals are known to fail, fractures in egr valve pipes and their seals.