WRT a 737 rating and going to Gatwick, I don't think it is a forgone conclusion. Out of 13 FO's that I know, all with <long haul hours in the logbook, all with 73 ratings, 11 onto the minibus, 1 (lucky b@st@rd) onto the 75/6 and 1 back onto the classics at Gatwick.
Good luck to all. Cheers
Buter