I doubt you will be in good shape insurance wise if you get into a crash using a Uber vehicle. Unofficial taxis/ limos would not carry proper passenger insurance.
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Typical of the cosy relationships between big business and government all over the country at the moment.
I have been using minicabs in London for many years - they are now more regulated but it was a free-for-all for a long time. Used to be a bit of a lottery on the quality of the car and the driver but much cheaper than the Black cabs.
I doubt you will be in good shape insurance wise if you get into a crash using a Uber vehicle. Unofficial taxis/ limos would not carry proper passenger insurance.