he is definitely the son of the vicar who lived in Palm Grove.
I have been to Ypres for the 80th Anniversary of Passendaele,The Somme and also on a WW11 War Grave trip.
My Great Uncle served with Liverpool Kings Regiment and his name is on their Memorial at Tyne Cot Cemetery.As not enough room on the Menin Gate to record all the names of those with unknown grave,the rest had their names on the panels at Tyne Cot.
If a British casualty was found days or weeks after casualties had been buried, they were quite often interred abroad in the local civilian town cemetery.
Apart from the websites shown research can be done at www.forces-war-records.co.uk
or by searching De Ruvignys Roll of Honour.
The libraries have copies of old local newspapers which show those wounded or lost in battle.Phone to find out which ones.
I have copies of Wallasey News
to show articles about my four great uncles serving in WW1, details of one recovering from shrapel in Bolougne Hospital, and then after being sent back to the Front his death at Third Battle of Ypres in September 1917. All this information is at Earlston Library Wallasey as he had been a Wallasey resident.
His name might be on War Memorial at Hamilton Square and census at Palm Grove might show more info but initial and date of death probably needed to check further. Send me a PM if you wish for a local Reseacher contact info. He is very good but would charge a fee.
Cohen might have been a Messianic Jew which is one who has converted to Christianity, hence the Vivar link.