One suggestion would be to contact Steve Bertram (SKB), here on this forum, and talk with him about what you want. Steve puts nice English guns up for sale from time to time, as he imports them from England. He has two on the For Sale forum now, for example. He frequents the English auction sites and bids on guns. With the knowledge of what you desire in a gun he can look for what you want specifically.

May God bless America and those who defend her.