Yep, which is probably in part why they went with the BBMF engine as opposed to the Just Jane ones, Retro assisted in the component change over to make it compatible with Vera, one would imagine as they already do the overhauls for the BBMF and probably did the spare, they wouldn't want to be disturbing engines that are overhauled by another party as in Just Janes, which I think were done by Maurice Hammonds Eye Tech Engineering.