After a period of consideration, the European Court of Justice (ECJ) has decided that Uber is a transport service, just like any other taxi company. There is lot to say about Uber's use of untrained, non-professional drivers and other abusive practices.
(Score: 3, Informative) by kazzie on Thursday December 21 2017, @12:32PM
Following up on that, in the UK, there are two legal categories for "taxis". Cars that can park in taxi ranks to wait for passing custom, or be flagged down by anyone on the street, are officially known as Taxicabs or Hackney Carriages. Another variety is the Minicab or Private Hire Vehicle, which has to be pre-booked (this could be in the form of a phone call to the firm's booking office, or even the driver's mobile phone). Both categories are licensed by the local authorities (county councils).
Uber's activities in the UK are closer to Private Hire than Hackney Carriages, but they've generally claimed that they were neither.