We have a responsibility to keep the roads and footpaths safe to use. Illegally parked vehicles cost us thousands of pounds a year in damaged paving, damaged grass verges, and cause serious problems for blind, disabled and older people. People are dissuaded from walking by damaged footways.
Furthermore, equipment belonging to public utilities (e.g. gas mains, water mains, sewer connections, telecoms services) can be damaged by vehicles being driven over or along raised footways.
Pavements are constructed and provided for pedestrian use. Vehicles parked on pavements may be:-
Parking on a section of public footway could be considered by a Police Officer to be "obstruction of the public highway". If there are waiting restrictions (yellow lines) on the highway adjacent to the pavement, parking tickets (known as Penalty Charge Notices) could be issued by a Civil Enforcement Officer, since a vehicle parked in this manner is in contravention of a traffic order. Waiting restrictions cover the highway from centre of highway to back of footpath.
If there are no waiting restrictions on the highway adjacent to the pavement, then the matter could be reported to the Police, and a Police Officer may deem that it constitutes "obstruction of the public highway".
It is an offence to obstruct the free passage of the highway. Obstructions are objects which have been unlawfully placed on or which overhang the highway. In some cases a licence or permit will be required from the Council.