I've competed in S X S events for decades.
Some have been strictly S X S events, and some have been S X S concurrents at larger NSCA sporting clay events. I've noticed the guns that were used, and the guns that won. I've won numerous events and concurrents myself.
But, I have never, not once, seen a "fine British best" gun win an event. I have seen them used in the competitions. I have even seen one make it to the shootoff. But, I have never seen one win.
So, what is to be gleaned of this? I have my opinion, but I will reserve it for now.
These are luxury items for royalty and those that have more 💰 then they know what to do with. These people do not preoccupy themselves with shooting enough to win competitions. New activity seems to be making poor people miserable by buying off politicians, political candidates or making our lives miserable in other ways.