I would relegate Westley to near the bottom of the 2nd tier, as they made many more rough and ready guns than best quality....notice I didn't say best guns!
...and for WRs drop-locks - does a gentlemen really need to see his locks? I think not!
Ditto with Wm Powell, Lancaster, Gibbs and the Watson Bros and so on - move 'em on down the line.
Rigby and Alex Henry more known for their rifles than guns.
The second tier - Atkin, Beesley, Churchill and Grant(nix the side lever tho')