Fixing cars in your garage

[friesian]

Is it legal for someone to start up an amateur car repair business in his garage? I live in a cul de sac of detached houses and the man beside me (who works fulltime) has started buying, selling and repairing cars in his garage in his spare time. He test drives them up and down the cul de sac, and revs up engines late at night. His family also park their own (4) cars in the little turning area at the top of the cul de sac, to leave room in their driveway for the heaps of scrap that he fixes. This means that visitors to the cul de sac who want to turn their cars at the top don't have room to do so.
Does anyone know if there are any regulations about all this, and do we have to put up with it?
Any advice would be much appreciated