GK Car Hire is one of the famous car rental companies, with a transparent service. You will be able to find the best price here and if in case if you find a better price for your car rental, then they will pay the difference. This company charges no fees for cancellation or amendment if done within a week’s time from your date of booking. The best part is that there are no hidden extra fees, they are transparent. Now, you know what you should do when you get to London to see around.