Hang on a second though births from the Markerson marriage go right up to Jun 1945 so can he really be the same man who moved to Leeds and married in the next quarter

Not much time to meet anyone else let alone court and marry them is it - just not sure this is the same man.
Plus if he got divorced from first wife he can't have committed bigamy. If they didn't get divorced then she (Phyllis) shouldn't have been remarrying either. What a tangle.
Finding a death for this chap before she remarried would be a bonus and rule him out as the man we are after.