Europcar say this ( for example ) : -
You will have to pass a security validation check by car rental agent
• Non UK residents/overseas customers (including Channel Islands and Isle of Man): must present their passport and one additional form of identification showing their home address (in form on bank statements or utility bills no older than 8 weeks). This is only required if other forms of ID provided (Driving Licence or ID card) does not show the customers address. All non UK residents must produce proof of Entry/exit to the UK (e-tickets are acceptable).
In any instance where a Passport/EU Citizen ID Card is not available / not presented, locations will not rent to the customer. In any instance where a presented credit card fails to trigger a DCC (Dynamic Currency Conversion) request in our system, then the card is deemed to be UK registered and therefore the customer must be qualified via an ‘Authenticate’ (UK resident) check. In the event that the customer refuses to disclose the associated UK address our locations will not rent to the customer.