the 'bailifs' (?) are talking rubbish. tell them that you have taken the reg number of their car and will be speaking to the local trading standards. (and the council )
the council has to inform you of their desision and then, if not in your favor,give you the option of going to a adjudicator. if you don't pay then, after this they would have to apply to the courts for a non payment to be put against you. then they can apply for the bailifs to come and play. also i would advise her to speak to the local police as these guys seem to be working a scam. and c.i.d may all ready have a file on them.