Yeoman, the paperwork you Brits have to deal with just to have a gun to shoot is unbelievable to me. I wish you well.
BTW, I know you say that you don't like Bess's but they are more fun than any other gun that I own. I have a Pedersoli Bess Carbine. It isn't really a copy of any one carbine in particular, but there seems to have been a lot less standardization in the carbines of the time as opposed to the long guns.
My Pedersoli carbine has hit targets out to 230 yards, (1 out of four shots, pure luck combined with lots of practice). It is also extremely strong and reliable, I once mistakenly shot off about 1400 grains of 2F in it. It knocked me down but the gun didn't take any damage so I know the barrels are strong.
Many Klatch