ClaudiusTheIdiot wrote:He has been passed as medically fit by the specialist and his gp.
It seems to me that the only avenue you have is to persuade him that it might be better (in your opinion) for him not to drive. I can't see why DVLA would take any notice of a report that he isn't fit since they have just returned his licence on the basis that he is fit and the appropriate doctors agree.
Much of the debate in this thread has been more about general principles. None of us can tell you if your relative is safe to drive. It appears that the DVLA and the doctors think he is. If you have new evidence which DVLA and/or the doctors didn't have, then report it. Otherwise it's a matter of friendly discussion.