When I went through the process in 2008 they had 2 sets of requirements, the first set was the same as this time "750 hours with 500 on type of 737/A320/757/767" or something similar. OR "full atpl 2000 hours with 1000 jet over ?? tonnes" or something like that.
AFAIK for long haul in BA you must have a full unfrozen ATPL.