Well there are two LHR courses in June that have already been dished out to applicants that originally applied to LGW but then they ran out of courses there.... maybe the easiest way to go lgw-lhr is just to apply again?
As for LHR applicants to be offered LGW that just isnt happening considering what I just said....if LGW are in dire need of crew, why not just use those who actually applied for LGW? Apparently there are LHR courses in June, July, August and Sept.