I applied back in October, within a few days of the main recruitment starting. I was 757-rated and got through into the hold pool in April. I was expecting a 767 position, as BA were known to be recruiting directly onto type, however in became clear that there were not enough internal transfers onto the 747 to satisfy the requirement, and so I think a number of 757/767 rated guys were offered 747 positions.
I know of someone who was 767 rated trying to apply during the 747 window, but he was flatly turned away.
Thanks to everyone who contributed to the Roster/Lifestyle discussion btw.