Well done, Gunman, you beat me to it. I wanted to look at the markings on the bottom of my BSA BLE for comparison before posting.

I noticed that the chopper lump barrels did not have a dividing line down the middle, and if they are dovetailed (the photo is not very clear)they are certainly BSA Jessops Fluid Steel chopper lump barrels.

Those BSA guns, although machine made, were built with first class materials and one taken in the white to a good action filer and then engraved would produce a lovely gun.