Tony, thanks as always my friend! Maybe someday you'll get the chance if you're ever in this neck of the woods.
Ernest, thanks as well. The GB has kind of slowed down a bit but still some good work getting done there...check it out when you can.
Kenneth, the two-tone scheme was the standard authorized scheme from Nov 1938 until July 1940 and there are plenty of photos (even color photos) showing units running around France in the two-tone scheme since that campaign ended in June 1940. The monotone Panzer Gray scheme wasn't ordered until July 1940 and while there's some debate/controversy depending on who you talk to about whether or not units were already using straight Panzer Gray prior to the July order but the paper trail of documented orders supports it's standardization only after the Battle of France was completed. This is compounded by the long held view based solely on black/white photos that Panzer Gray was the norm for BoF and all the major kit makers kept stating monotone panzer gray in the finishing guides. Only recently have manufacturers like DML (as evidenced in their recent Pz III E, Pzjgr I, and Neubaufahrzeug kits for example) changed that based on the actual orders and timeline established by Jentz/Doyle in their research of the original order documents and timelines for scheme adoptions.
I personally take the view based on the evidence currently available that the two-tone scheme was the standard for both Poland and Battle of France and that Panzer Gray vehicles, if they did indeed exist at the unit level prior to July 1940, were in the minority and not the majority as previously believed (especially since you can never say "never" or "always" when it comes to German gear in WW2!). The two tone scheme is very hard to detect in black/white photos even under optimal conditions...add in poor lighting and a layer of dirt/dust and the contrast between the two virtually disappears.
So much new information comes to light all the time even after all these years and the great thing about the hobby is that yesterday's doctrine or accepted practice can be disproved or updated as more and more people continue to dig into the past. It keeps the hobby alive and dynamic IMHO.