ok well its a civil matter, really, maybe it is a big mean dad, but front him, hes hardly going to give you a pasting, i mean a prison sentence over a ticket, hes entitled to a full refund, type up a recipt and get him to wet sign it at the bottom and signed by another impartial witness such as joe from 4 houses down, the police are powerless to settle disputes like this, hence why its a civil matter, the police can become involved if a threat of violence is carried out, dont expect the police to rough him up a bit and take him to court and then off to prison, a caution is prob as good as it gets unless the threat is carried out, dont back down, you do have the power to do things yourself, such as citizens arrest, all you have to do is read the rights, say your name and why your doing it, but get a recipt and signed by witnesses if not pop down to a solictiors flutter your eyelids they might give you a bit of advice free of charge