Given that there are something like 20,000 black cabs in London, I'm seeing your one outlier from 10 years ago as a pretty solid argument in favor of them. And that's before we start debating about the merits of driver vetting processes and vehicle maintenance requirements.
And this is why Uber lots it's license. It wasn't properly vetting private hire drivers. It's not hard. Follow the rules and they'll get their license back.