I really don't do very much with air rifles these days. I've still got pistols on the table I need to get plinking with.
I've never tried importing a rifle.
I've got a couple of Relum Slavia 618's -----even smaller than a Webley Junior/Jaguar. I am quite found of the build of the Slavia ZVP pistol but they tend to shoot quite high, which spoils the fun.