What’s my legal position if someone parks their car across my driveway so that I can’t put my car away at night?
If there’s an official “dropped kerb” installed by the local authority at the end of your drive then under the provisions of the Highways Act 1980 the crossing may not be used as a parking area. You should ask the police to tell the car’s owner to move it. There is no legal right to park anywhere on public roads except in an approved parking space, so (assuming this is a public road) the police can prosecute anyone for obstructing your right to pass and repass over it. The police could tow the vehicle away if necessary. If one particular motorist constantly leaves his or her car blocking your driveway you could seek an injunction preventing them from doing so.