I really wish people would stop assuming that banning Crufts, one championship show out of many, would have anything to do with breeding dogs, deformed or otherwise.
Look to the breed clubs who write the breed standards, the Kennel Club, the judges (who judge all around the country or even world), look to the vets who saw in person, and agreed that the Utility Group winning French Bulldog met the bloody breed standard which states very clearly the dog should have a muzzle that is visible in profile, and open nostrils!
Crufts is the visible-to-the-public trade show and champ dog show, it may seem like the biggest thing in doggy terms of the year, but in breeding dogs... it has little relevance. Banning it would change nothing.
Even banning showing dogs... would change nothing, look at the XL bully mess, the exotic bullies, the micro bullies, the olde tyme bulldogges, the mish-mash of wolf-a-like northern breeds unsound and riddled with cancers - all massively fucked up because there are multiple ideals, multiple 'breed standards', tons of people all producing different dogs without a thought to health or temperament. Look at all the puppy farm bred approximations of pedigree breeds, the giant poms, the microscopic chihuahuas, teacup yorkies and so on. Very few of those are shown at all, even in their own made up registries and clubs where those exist... and they're all full of horrible health AND temperament issues. It is completely legal to breed an animal who cannot breath and will suffer horrific pain all its life.
Making it actually illegal to seek to breed dogs with no muzzle and stenotic nares..., or other defective, life limiting conformation, would. But the current (and previous tbh) government gives zero shits.