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To be fair, the Man Who Wasn't There's case is being considered by the CPS, with a view to prosecuting him for misconduct [in a public office]. Looks to be a true bill (forgive the pun). Should get home on that, and it can result in a severe sentence of imprisonment. It's an easier charge than obstructing the course of public justice; if you falsely claim to have seen something which had, in fact, occurred (granted that it may not have, but the standard of proof gets in the way), how is that 'obstructing the course'? Perjury proper, is ruled out, though tempting , because his statement hasn't been tendered in 'a judicial proceeding'.
That police officers might invent shocked bystanders is no surprise. It's done to justify arrests for public order and discrimination charges. Policemen have been doing the like for years. Women had to be seen to solicit two men before the charge could be laid. Amazingly, every woman arrested for soliciting around King's Cross had approached two men of exactly the same description. It was exactly that of two officers, a sergeant and an inspector at the police station for King's Cross, as well.Strange that !