It should be. I'm sure the way police handle things in the UK are different than the US. But I can tell you from first hand experience, that most police officers or "pigs" as they're affectionately know as, do not do a very good job of "protecting and serving".
You know, it's not actually their responsibility to protect you (that is
your responsibility)... Yeah, if they saw something happening - I'm sure they would step in and do something about it though.
Think about this...
If it actually were their responsibility to protect you, you could sue the city if you ever got stabbed in a mugging or something...
They only react - they don't necessarily
prevent anything... (Not saying they don't try to prevent crime - but one guy can't be everywhere...)
Anyway... It sounds like the laws in the UK are similar to the US.
I think getting the word out to all the cops to be aware of the law as it relates to photography is a good thing. At least they realize that there is a problem, and have decided to do something to try to correct it.
I don't know if the same can be said over here...