Hi Amanda,
I am sorry to hear that you felt demeaned but I completely understand as I would have felt this way too.
Ok, this, to me, is just BS and more about them trying to scare you. What does leaving your car parked in a public place have to do with Breach Of The Peace and Causing Fear And Alarm? Hundreds of thousands of people in Scotland leave their cars parked in public places every day.
This is just nonsense. CDing is not illegal in the UK so clearly, we have a case of police discrimination IMO.
I agree with others that have said that you should go and get some clarification on the laws of what they "claim" is the law. I'm sorry to say I think this is police victimization.