Thank you folks - I have a club buddy uses an Adler lever-action shotgun, and I love lever-action rifles, so that immediately appeals to me but I can't see how they aren't regarded in the same way as pumps when it comes to section 1? So a rifled barrel on one of those would fall foul of the regs in the same way?
There are some comps for "classic" shotguns - O/U, S/S, single barrel - I should look into this more, extra shooting fun! When we're allowed out to play again!