If you look at the history of the ROAC you will find that between 1942 and 1943 it was reorganized with the REME. The REME took over some functions of the ROAC and the ROAC took over some functions if the REME. They may have transferred personnel. So Thomas might have been with the REME in 1942, but when BC filed he was in the ROAC or visa versa. I have Ancestry, but US only, I see some results but no details from World. There is a database "UK, Army Roll of Honour 1939-1945" all I see is name Thomas Hinton and date of death I only see year 1942. If the full death date is after July 1942 this could be him unless you know he survived the war or was alive after 1942.
http://en.wikipedia.org/wiki/Royal_Army_Ordnance_CorpsSome search engines can use a wildcard so search *811740 or 811740* or 8*11740, 81*1740 etc.