"Are not these demands to appear before the local beaks now called "postal requistions"?"
Indeed they are. But the usual way to invite alleged miscreants who have perhaps committed minor traffic offences for an appointment with Their Worships is by way of a "Single Justice Procedure Notice". This is so-called because such matters are - initially at least - heard before a single JP sitting with a Legal Advisor in an office, determining matters on the papers.