If someone is "obstructing" them it should be immediately obvious. It would be someone standing in their way somehow, actually physically obstructing them, yet the article says -
If the police have to actually pause what they are doing and carefully scan bystanders to make sure they aren't pointing a cellphone camera at them, then most likely those bystanders aren't actually "obstructing" them are they?Officers have been told to look out for members of the public trying to video them when they attend 999 calls.
This is all about preventing police being recorded in action, plain and simple.