The Brighton & Hove Hebrew Congregation memorial tablet commemorates a D W Balchin, who is also mentioned in the Chair of the Jewish Historical Society (Sussex Chapter) Michael Crook’s talk. 
However, military records appear to show that the details in Michael’s talk belong to a William Henry Balchin, who served as a Gunner with the Royal Field Artillery, “A” Battery, 242nd Brigade (service number 193802) and whose address was given as 438 London Road, Westcliffe, Essex in 1915. 
William Balchin was the son of Henry Balchin and Georgina Jackson and he had three siblings – Georgina, Percy and Alma. He was married to Rebecca.
His death was reported in the Jewish Chronicle.  A photo of William and a picture of his grave are featured on the We Were there Too website.
There was also a Private F Balchin who died on 4 Nov 1918. He served with Mechanical Transport, 35th Auxiliary, Petrol Company, Army Service Corps, service number DM2/155079.
He is buried at St. Sever Cemetery Extension, Rouen, France. 
The connections (if any) between the different soldiers with the surname Balchin and with Sussex need further investigation.
 Imperial War Museum, Brighton and Hove Hebrew Congregation Memorial Tablet [Accessed 2 July 2019]; and Michael Crook, JHSE Talk,
Nov 2018, p.39.
 British Jewry Book of Honour, Part 1, p78 mentions Gnr W Balchin of A/242 Brigade, RFA, address as above; and We Were there Too [Accessed 2 July 2019].
CWGC.org [Accessed 2 July 2019].
 Jewish Chronicle, 14 December 1917, p.191.
 Commonwealth War Graves Commission [accessed 2 July 2019]