I've run into them from between Bethune and Arras north - right now, as Mudwasp said, the only squadron to be fully outfitted with them in mid-late September is MFJ 1. Supposedly some other squadrons have them, but only one or two for escort duty on two-seaters - dunno, since all I've seen are the naval flyers in E1s - sometimes alone, sometimes in pairs.

They seem to be based at Nieuwmunster, about 7 miles NE of Ghistelles (a regular destination for us happy RNAS pilots), and I've often thought of going over there and kicking the hornet's nest. But I'd like to have Alvin survive to get into a N10, so I'll probably just take them as they come.