Britain's second city Birmingham is seeking clarity from Uber on its business model as it decides whether to renew the taxi app's licence after granting a temporary extension.

Uber, which is fighting to keep its cars on London's streets after the regulator deemed it unfit to run a taxi service, saw its one-year licence in Birmingham expire last month.

"Officers in our licensing team have temporarily extended Uber's private hire operator licence in Birmingham, whilst they seek clarity from Uber around its operating model," said the council's Acting Director of Regulation and Enforcement Chris Neville.

Uber has made a series of changes to its business model in recent months, responding to requests from regulators, including the introduction of 24/7 telephone support and the proactive reporting of serious incidents to London's police.

The firm's licence in Edinburgh is also due to expire next week with a renewal decision pending, according to the council's website.

A spokeswoman at the council did not provide an immediate comment on the status of the application on Thursday.

An Uber spokesman said: “Our licence renewal application in Birmingham is still being processed and in the meantime the existing licence has been extended. In recent months we have been granted licences by a number of councils across the UK including Sheffield, Cambridge, Nottingham and Leicester.”