As you may be aware, all London licenced taxis have a screen between the driver and passengers, on top of which the built in credit card facilities are handily located in the rear of the taxi. This means the passengers and driver never need to make any contact ,  also the government have dictated that all drivers should wear face masks . Finnaly all drivers are strongly advised to whipe down the surfaces in and outside the taxi after every use .

Hopefully these measures should help alleviate some of your concerns .