Daniel’s link pretty much covers it, but I’d like to add the following :
If the filming happens in public space ("espace public"), there
should be no reason to ban you from filming.
Conversely, if the filming happens in a restricted/security area (i.e. military facility, nuclear power plant, etc.), it’s most probably illegal (and probably visibly displayed)....
You are allowed to ask the police whatever questions you like. There is an upper limit that you can't refuse to obey a lawful order on the premise that you want to ask a bunch of questions, but they don't seem to have ordered you to do anything, so you can ask away. They have no obligation to tell you anything or to be truthful, except for certain questions ...
It depends on the type of warrant. Failure to pay a fine is not necessarily an arrestable offence.
The Police Scotland Warrants Standard Operating Procedure (710 kB PDF) states:
5.3 Whilst there is no legislative requirement for Officers to physically possess the warrant to force entry / effect arrest, it
would be considered best practice if a forced ...
If a sheriff officer has permission from the court to enter your home or workplace but you don't let them in, they are allowed to use 'necessary reasonable force' to get in.
This means they're allowed to get in by:
forcing open a door
breaking a lock
breaking a ...