Streetcar who I was with, turned out to be thieves who pursued me for a parking ticket that was their fault as one of their dumb advisers told me to park in a place which was not allowed. So I was looking around and found Connect by Hertz who offer annual membership for free unlike Streetcar who charge £99.
They have cool minis too! This is currently just in London.
Offer has been running for a while, don't know when it finishes.
Good to sign up as it's free and you never know when you might need a spare car or van for shopping/moving house etc.