You might assume that you can just get a regular car insurance policy for your classic car but this often isn't the case. The main reason for this is that insurance providers consider classic cars to be higher risk. Classic cars generally cost more to repair and often don't have a set market value so getting cover from a specialist provider is the way to go.
Every car in the UK needs to have insurance in place to be road legal so make sure you get cover for your vehicle, even if you only use it on rare occasions.