Will my policy cover additional drivers who are not UK residents?

Yes, the policy will extend to cover additional international drivers providing they hold a valid and internationally recognised driving license and they are named as additional drivers on the rental agreement.

An Additional Driver cannot hire a Rental Vehicle independently from the Lead Named Driver but can drive the Rental Vehicle unaccompanied by the Lead Named Driver so long as they adhere to the terms of the Car Rental Agreement at all times.  At the time of rental, Additional Drivers must be aged between 21 and 84 years old (inclusive), hold a valid and internationally recognised driving licence and not be driving against the advice of a medical practitioner.