So at StreetCar you can rent a car by the hour. They’ve got 500 pickup locations (and I think this is just spots where parked on the side of the street). It’s about 5.95 pounds ($12 an hour) for a Golf (Polo for 3.95) an hour or 49.50 pounds a day (and you get 30 miles of fuel). You must be a member for 50 pounds a year (show your OysterCard and get two memberships for the price of one).
Assuming you don’t have a need for a car very often, this is economical and ecological: you don’t need to pay for a car or insurance or parking, except for the times you need it; it’s such a waste otherwise if you don’t use it often. You don’t need to maintain it or anything like that. If I lived somewhere like London I would only need it a time or two a week (at the most), maybe big shopping trips.
This is very cool IMHO, this is the idea of of Sci-Fi/Future Utopian stories. Every shares a car or bicycles and has great public transportation. This is very unlike Michigan with poor public transportation and everyone owns a car (or two).