Read this excellent piece at Engage from a few months ago by James Mendelsohn.
Now look at the comment Stephen Sizer leaves below:
Last Friday, in fact, for the fourth time in recent months, I had a meeting with CID officers and they confirmed that they regard these attacks against me as harassment. They also confirmed that in their detailed investigation I have committed no criminal offence. Indeed they asked me to help advise them in similar cases, as have officers from the Metropolitan police monitoring religious groups promoting religious extremism.