Hi Bart
Beecroft is in
http://www.naval-history.net/xDKCas1940-06JUN2.htm simply as died. He is recorded as being on HMS Daedalus which I believe is the name of the Shore Establishment at Lee-on-Solent. Both Ritchie(20/5/40) and O'Brien(6/6/40) are also recorded simply as died and both were serving on HMS Peregrine which I believe is the name of RNAS Ford
Regards
Dick