It's illegal to block access to the highway but not to your drive, so if someone blocks the entrance/access to your driveway, thereby preventing you from driving out of it, they are committing an offence. However, the same does not apply if you are prevented from driving into your drive. Under those circumstances, there isn't a lot you can do and a lot depends on the local authority that you live in. However, parking across certain dropped kerbs is also contrary to Rule 243 of the Highway Code which states:
Do not park or stop:
- where the kerb has been lowered to help wheelchair users and powered mobility vehicles
- in front of an entrance to a property