Check this out.

Streetcar offers self-service cars for rent by the hour, day, week or month. The cars are parked in a dense network of dedicated spaces in several UK cities. Our new Volkswagen Golfs can be booked for as little as 30 minutes or as long as 6 months. They are reserved online or by phone, and can be collected and returned 24/7 using one of our high-tech smartcards and a PIN number.

Usage charges are based on how long you have the car, and how far you drive. We just send you a bill once per month. It is free to join, and there are no monthly or annual membership fees. When you join, we just take a £150 returnable deposit which we repay immediately if you no longer want to use the service.