Hi Keith
I have Lieut
Harold Easton Sheppard also in a Vickers F.B.19 and from somewhere I have got the serial 5233. However, this serial belonged to an F.E.2b with No 18 Squadron, so I suspect it should be A5233; if that is the case, it seems to have migrated to No 111 Squadron since I have Davidson flying it in that unit on 4 October 1917.
Graeme