Robert,
According to the same sources, #679 (GC 1/2, 1ere escadrille) wasn't downed during battle of France. Sure there is an error with codes somewhere but who made the first ?
For GC 1/8 i've found :
may 11 1940 Bloch met Me109 and 110 covered He111 :
Bloch 152 # 369 crashed at St Germain sur Meuse (pilot Lt Flandi KIA)
# 534 crashed at ? (Pilot Adjudant Guy safe)
# 537 crashed at ? (Pilot Cpl/c Spatchek bailed out and was safe)
Badly, no time to give.
I'm going to look for more infos but my knowledge about Bloch 152 is poor.
Good afternoon.
Stéphane