Hi Liz, If you search Ancestry under Fred Ovenell you will find his military records and also within them his declaration that his name is Benjamin Charles Pryke. Probably now you will be able to find further records for him under that name. His service numbers were 18391 Hampshire Regiment and 68695 Worcestershire regiment. His discharge date was 22/2/1919 and he was living probably in Highgate, London. Good luck with future searches, Vic 9082.