Ok can someone explain this to me? Can I film the police or can't I? They stop me for something and I want to film the process, they try to take my phone, I don't want to give it to them. In what situations will I be going down to the station over this?
There is no specific law which says you can't ...
... but there are a number of situations which may lead to difficulties -
(1) If you have filmed something of a criminal offence, the officers may have a common law power to seize it as evidence of that offence (this is all a bit vague, and would probably only be justifiable in the case of a serious crime). They couldn't arrest you just because you had evidence in your possession ... but if you failed to hand it over that may be enough to lead to a charge of obstruction.
(2) If, by filming them, the officers can show that you obstructed them in the course of their duty in some way, that would be an offence for which they could arrest you. Obstruction is much wider than just physical obstruction ... but I think it would be pretty unusual for any Court to agree that simply filming in a public place would amount to obstruction.
(3) Particularly if they are employed on anti-terrorist duties, it
is an offence to "elicit or publish information about a constable which is useful to a person committing or planning terrorism" (s.58A Terrorism Act 2000 as inserted by s.76 Counter-Terrorism Act 2008) - taking a photo, especially with intent to place it on the internet
may amount to such an offence and if there are reasonable grounds to suspect it, an arrest would be lawful.
Like most things, therefore, there is no simple yes or no answer and you need to deal with each situation on it's merits. If you do not believe that the police have any right to seize the phone, then do not volunteer it, but be aware that that
may mean that they will arrest you. If they do, physical resistance is pretty pointless (you simply won't persuade them not to arrest you by fighting them ...) but make a note of all the details and insist on seeking legal advice as soon as you arrive at the station and every time you are asked your representations on what is happening, state again your position and your feeling that it is all unlawful and ask that it is written down on custody record, etc. Ask to see the Duty Inspector and make a formal complaint about your arrest being unlawful as soon as possible.