You will find that most Insurance Companys will not accept you as a named driver on your dad's policy for a Renault Sport. Well not until you are at least 25. Even some of the specialists like Adrian Flux will not cover you. So that is a route you will not be allowed to go down as so many others used to do this illegally the Insurance Companies are closing this loophole. So your only choice will be to Insure it in your own name and pay through the nose for the privilege. As others have suggested drive something smaller to establish your No Claims and keep yourself out of any trouble with speeding not to mention drawing unnecessary Police attention to yourself in a hot hatch.
I know all this as my son has been involved in the modded car scene for some time and I tried to put him on my Insurance. He had a Megane 2.0 coupe at the time yet they still refused to put him on my insurance as a named driver until he is 25. We were both using the same Insurance Company as well at the time.
He sold the Megane as he was getting fed up of being stopped every week for driving a non standard performance car.
I know all this as my son has been involved in the modded car scene for some time and I tried to put him on my Insurance. He had a Megane 2.0 coupe at the time yet they still refused to put him on my insurance as a named driver until he is 25. We were both using the same Insurance Company as well at the time.
He sold the Megane as he was getting fed up of being stopped every week for driving a non standard performance car.