Actually, it's fairly easy for the police to manufacture an indictable offence...they just tag the words "conspiracy to..." on to whatever it is they decide to charge you with.
The word "conspiracy" automatically makes the offence indictable (my son was charged with "conspiracy to cause criminal damage", which had to be tried at a Crown Court. The Judge happened to see through the police and CPS motives for bringing the trivial case and dismissed it immediately at a preliminary hearing).