When I said "banned" I did not mean "illegal", I meant "not allowed". Although it's possible it could be covered by one of the more general railway bylaws.
Network rail quote:
Link to Network Rail document "Guidelines for taking photos at stations" with the above quote:
What you need to know about taking photos and films at our stations to ensure a safe and enjoyable experience.
www.networkrail.co.uk
BTW Try this at a major London terminal (for example) and you will probably find yourself arrested on suspicion of some sort of "preparation for an act of terrorism" offence.
You’ll certainly be detained, searched and person checked - but unless you refuse to the legal requirement to provide your name / dob and address you won’t be arrested.
Whether one person finds a behaviour odd, or unusual doesn’t make it illegal - something a significant number of police constables have difficulty with.
Often quoting “current climate” as a their reasonable suspicion to detain / gather personal data and search.
If you really were preparing an act of violence against our country would you really wander into a major railway station and actively take overt pictures of cctv cameras and other security equipment ? Unless your the worlds stupidest Terry the terrorist !
The police namely BTP have in the past assisted murderers in their slaughter of innocent people (Manchester arena) - officers assigned to a position abandon their posts to have meal break.