Thanks Wally Mk2,
I think this is exactly what I was looking for:
Yr ref to ENR 1.5 par 1.10.1 etc doesn't actually say circling MDA just circling meaning in the case of day & cat B 300ft & all it's limitations.
I just hope that this is exactly what people at CASA think when they write the exam questions. :-)
So ... how often do you get to practice this unfunny thing ? :-)