"The Police do this as a job.......and don't give it another thought" I seriously would question that scurrilous claim - that is to suggest that the Police are mere auomatons who have no feelings one way or another. Simply untrue and I speak from wide experience. Believe me, although the Police are essentially neutral, an Officer is just as interested to nail the "bad guys" as anyone else. They don't get paid any more for it, but professional pride and the quest for justice dictates that the Police certainly like to see the guilty get their come uppance.
They, however, also have sympathy when people are caught up in situations such as this where it would appear that crystalbee and here OH have been caught up in a dispute whereby their landlord is seemingly hell bent on having them found guilty of some criminal matter or another. But ultimately the Police are bound by the laws of the land and are committed to enforcing them without fear or favour.
To crystalbee I'd say this:
Please try to have your solicitor, if you have one, keep on the case, as they say, and within reason have him/her contact the Police and get as much detail as possible as time goes by. However, the Police also have their hands tied to a certain extent if they're waiting for the CPS to come to some sort of decision. After all, you want them to reach the correct one, yes? And you obviously hope that their decision will be NFA (No Further Action).
Re your antecedents being taken at the Police Station, again, consult your solicitor, or failing any interest from him/her, it may be worth contacting your local CAB(Citizens Advice Bureau) who should be able to give you free legal advice - hopefully? It's also worth writing to Liberty - or even canvassing the Home Secretary.