120.4 - I think you have been 'led up the garden path' somewhat.
I can't quite work out why it would save costs to train to CAT 3B instead of 3A, but this is an incorrect statement.
I would only be guessing, but I imagine the captain of the said aircraft had good operational reasons why he needed CAT 3B on the day.
As for your second question, I cannot speak for all BA fleets, but on the 737 when required in LVP's, we fly CAT 3A approaches to an autoland wherever possible.
regards,
P.C.
(edited for ambiguity - thanks Beamer !!!)
[ 21 February 2002: Message edited by: Positive Climb ]</p>