“It seems to me that a PNC record that did not include the basic history of J’s involvement with the police would be an incomplete and potentially misleading record. Moreover, if a similar allegation were made against J in the future, it would be profoundly unsatisfactory if it fell to be considered without knowledge of the earlier allegation and the arrest and investigation to which it gave rise. I am satisfied that retention of this kind of information in the PNC record is justified on any view. If it engages article 8 at all, the interference with J’s right to respect for his private life is small and is plainly proportionate.”