If Wolfenbill is correct in his identification, according to
The Sky Their Battlefield by Trevor Henshaw, 10 sqn lost a BE2 to Anti-Aircraft fire at 7.15am. Capt. HC Lomer was killed, and Lt CT Bruce died later from his wounds.
Other aircraft lost on the 5th May, were 2 FE2ds, and a Spad 7.
Unfortunately, Henshaw does not give a location for the BE2.
Mike