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Do you have a dropped kerb driveway?
That would not amount to an offence then. if he causes an obstruction the police can intervene by issuing fines but they will do not do that. The days when they have become involved in that type of dispute have long gone I'm afraid.
The local councils may be interested if there is actually an obstruction but the meaning of obstruction has been considered by the higher courts and its been held that it must literally make it impossible to maneouvre.
Alternatively you can try to get an injunction from the civil courts to stop this. The truth is that its hard to enforce though and quite expensive.