You would need to know who owns the land on which the vehicle was parked; unless it is privately-owned, then, yes, the parking restrictions probably apply.

This quotation from a local authority would seem to bear it out:

"Parking restrictions such as yellow lines also apply to verges and pavements. Restrictions extend from the centre of the highway to the nearest property line, therefore vehicles parked on a footway or grass verge behind yellow lines can be issued with a Penalty Charge Notice."

Edited by FP on 26/03/2012 at 19:31