Thanks DBC, rabqc

my wife (not disabled), with 2 toddlers, parked on a disabled bay at waitrose because all parent/child bays were full. on a previous occasion the attendant had allowed disabled drivers to park on parent/child bays. my wife assumed it would be ok for her to do likewise. she has been given a £40 penalty by CP.Plus. The only notice displayed states it is 2 hour free parking but a penalty is payable if overstaying. There are simply "reserved" notices for disabled and parent/child bays. There are no notices re penalties if parking in the wrong bays. No parking charge is required. Is she contractually bound and if so should she pay the penalty?