“…l give rise, day by day, to a further cause of action – on a rolling basis – would seem to me inconsistent with the principle in Cartledge v Jopling & Sons Ltd [1963] AC 758. There may, of course, be cases where there is some new and supervening act or omission. But, otherwise, as Hobhouse L.J. put it in Knapp v Ecclesiastical Insu…”