Police officer claims - you can't film this.

Last year I pointed out how much the police hate it when you film or take photographs of, well, pretty much  anything, but in particular them; and how in some US states they were even using wire-tapping laws to prevent this. It it therefore worrying to read that during an Edinburgh Uncut protest on officer told someone filming an arrest that they were

"not allowed to record a police action"

Really? Under which law would that come? While the arrest made seems harsh on its own; this statement is just chilling.