I also run a Blitzortung station here in the UK - much like yourself.
We had some local strikes from a heavy shower about 5 miles away which both detected by both systems - the 266 was accurate to within a mile of the Blitz lightning network which I thought was impressive for a non-triangulated detector.
I remember your response to my post about the window comparator mod I made to my Green 6.8USB board. I added an AS3935 to my RED kit, but I have yet to experience close enough lightning to really check it out. I am glad to hear that the Ventus is working well. I made suggestions to both Accu-Rite and Davis (VP3) to add lightning detection. It looks like the Ventus beat them to it. It seems to be a well executed product.
Since you are a dealer, if you are willing to do a tear-down and post photos, I think that it would be of great interest here.
Greg