There's MyTaxi, Gett and Addison Lee has an app. I used to use Hailo before it became MyTaxi. It's certainly not as cost-effective but what I did like were the flat-rate rides you could get. They weren't black cabs, but more like Uber Luxes or Uber Execs and probably 20% cheaper than black cabs.
With Uber gone, I'm sure the market would provide something else.
With Uber gone, I'm sure the market would provide something else.