George Edward "Ëddy" Ralph. Help needed please.

My Father-in-Law, George Edward Ralph spoke of being in the Commandos during the war. I'm trying to research the family history and want clarify what he did. The RBL found out for us that he was in the Royal West Kents until Dunkirk, then his records say he went into the Recce Corps and then into the Pioneer Corps. We understand he may have been busted from Captain to Private, possibly by Lord Lovat?? Can anyone recall any information about him actually being in the Commandos or know anything of his courts martial?
Thanks.