However.............There was a small note in last month's AOPA magazine that the CAA are currently discussing the possibility of an NPPL(H) with the reduced medical requirements and non CPL instructors.
Personally I would welcome it, as all my flying is day VFR in the UK anyway, my fixed wing flying could be catered for by an NPPL and the only reason to have to keep up the yearly Class 2 medical at the moment is for my rotary license. It would also mean that I could do an NPPL AFI course without the drudge of the CPL exams.