Hi. Thanks for your reply. He is William Martin Geen, not Green. I can assure you you are not the first person to think it was a typing error! even on the hand written Record awarding him the Military medal it is written as Green and then had the "r" crossed out!
Medal listed in The London Gazette supplement 23rd July 1919.
His regimental number on the medal is 146554 SPR W. GEEN, and the pink record card has in the Corps column, ASC then underneath RE. regimental Number R4/069252. Victory Medal Roll RE/101 B80 page 16925. Again, thank you for your fast response, much appreciated.