For those swimming and wondering I seem to remember that the 'delay' so to speak is purely down to training capacity on both the 744 and the Airbus.
As part of the BA cost cutting measures new terms were agreed with the TRI's and TRE's to reduce the costs within the training department during a period where no recruiting was planned and the only training was to be command conversions, LPC/OPC, route checks and ATQP training.
It has led to a drop in training capacity that will take a little while to renegotiate back up. It is happening though.
Have fun.