[jsudhams]

Not sure about the UK cabs way of work. But what stops them being a UBER cab driver as well? Isn't it a additional channel? Like in radio taxi can't they simple make themselves busy when they get UBER call so that the cab company does not assign them any additional pickup/drop?

[dagw]

At least in Sweden, to be a cab you have to clearly mark your car as a taxi, clearly post your rates in the window and have a verified taxi meter in your car to make sure you actually charge the posted rates, and Uber doesn't want to do any of those things.