I have to agree with BizJetJock and cannot understand where Rainboe is coming from on this and another (monitored approach) related thread. I don't have CAT III experience but have many years experience of CAT II, CAT I and NP monitored approaches.
In my experience FO has always flown approach to DH/DA etc., and has executed a GA if no 'LAND' call from CAPT. A 'LAND' call means 'I have control to land (or GA if something subsequently arises to preclude landing safely). It is a system which is easy to train and works very well in practice.
Any approach below CAT I minima will always be auto-coupled so there should never be a 'hand-over of control from one pilot to another', merely the disengagement of AP (nicely trimmed a/c one would hope) by the designated pilot (experienced CAPT hopefully).
The idea of a CAPT monitoring inside and out from 1000ft down to DA, looking up, deciding and then landing from 100 ft atd or less is frightening and certainly NOT a monitored approach. I can, however, see that this could and should be a requirement for an auto-land approach.
Rainboe, I don't know what BA's CAT III training comprises but, unless it specifically incudes a great deal of CAT II training, there should never be a reversion from CAT III auto-land to CAT II manual land and certainly not with a defective AP and incapacitated pilot.
rts