In many areas, local authorities have taken over control of routine parking matters from the police and traffic wardens. In such areas, 'illegal' parking has been decriminalized and it's no longer a criminal offence. It's now simply a '
contravention'. Council enforcement staff can issue a 'parking charge notice' (= 'a parking ticket'), under code PCN 62, in respect of any vehicle parked with one or more wheels on the footway of an urban area:
http://www.parking-appeals.gov.uk/RegAndLeg/PC NconCodes.asp
However, if your driveway is narrowed to such an extent that you can't easily get your vehicle in or out, the drivers of the other vehicles are guilty of a criminal offence under
Section 137 of the Highways Act 1980 (which deals with 'wilful obstruction of the highway') and/or
Regulation 103 of the Road Vehicles (Construction and Use) Regulations 1986 (which deals with 'causing or permitting a vehicle to stand on a road so as to cause an unnecessary obstruction').
This might be relevant:
http://www.theanswerbank.co.uk/Motoring/Questi on502972.html
Chris