Where did this happen and what exactly does the Notice say about the powers under which it was issued?
At the moment, generally speaking (at least in England and Wales), penalties for infringements on private land are a contractual matter between the driver and landowner. The Protection of Freedoms Act 2012 changes that and in future the liablity will rest with the keeper. That section is however not yet in force, expected to come in during the Autumn.
If however APCOA are acting for a Local Authority then they're already likley to have power to enforce via the traffic unit at Northampton County Court.
If issued on an airport or railway land their may also be a power of 'criminal' enforcement via magistrates court.
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