If the vehicle is blocking access to your driveway you should first make enquiries with the neighbours to see if they know who the car belongs to, so they can move it.
In most areas local councils have now taken on responsibility for enforcing parking provisions under what is known as Civil Parking Enforcement (CPE). Under CPE, it's an offence to park a vehicle that blocks a dropped kerb driveway. You can check if your local council has taken on CPE via the link below:
If your council has taken on CPE, you will usually need to report vehicles that are obstructing a dropped kerb directly to them – you can contact them via the link below:
If your local council hasn't taken on CPE, you will need to contact your local police force.
The police/council policy for dealing with such matters may vary between forces/councils. Some police forces may only attend if your car has been blocked in and you cannot get out.