2D,
A published approach without any minima? That would be a strange animal, never seen one of those, but that could just mean I haven't flown in most places. I don't see anything thet says 49(7) is only for aerodromes having published approaches, but if that is the basis for saying you can fly a 0/0 approach to a class G then fair enough. Very peculiar for a regulator like the CAA, who are generally far more strict than the FAA on supposed safety matters, to let that one get past
Cheers