What rights does a private buyer have?

My nephew has bought a tipper truck privately, 20 mins into the drive home the EML came on and now a red EML (turbo boost problem) He rang the seller who denied all knowledge but said book it into a Merc...

Is there an electric pick-up or tipper on the market?

I work for a Parish Council and want to replace our pick-up which is four-wheel drive (a necessity for some of our sites). The Council are keen on going electric - can you get four-wheel drive pick-ups...