Miller,
I have pointed out at least twice that it is not only sleeved guns that are failing English proof. Id just as soon find a gun that doesnt have a reason to go through the proof process, again,wouldnt you?
I find it curious that you dont concern yourself with the proof laws of a country that never found itself outside of the Brussels Convention. Did you ever consider that perhaps there was a good reason or two that sleeved guns dont get past the view phase of a proof inspection in France?
Pretty much my point is if you are in the market for a double gun, figure out where you are on the food chain of guns, and buy the best example you possibly can.
I believe you can always do better than a sleeved example. An example of an in original condition and proof gun will be the better buy, even if it costs more.

Best,
Ted