Re: Pressing charges
How about illegal detention?
The only argument they could use to detain him would be a citizens arrest, but you can only do this if you know an offence was taking place which the police have confirmed has not happened.
The other one I would go for is 'calling the police and running away/wasting police time', there is no way the copper should have let them just walk away without pointing out to them that they were potentially breaking the law with their actions.
Biting the hand that feeds IT
