I had reason to call the police about an aircraft about which I was worried. They were very good. They took me seriousely though I didn't indicate that I had any special knowledge. They passed on my concerns to the relevant agency and kept me informed as to whether the a/c made it home. CAA rang me later to tell me all was ok and asked if I wanted to raise it as an issue. I said that I was happy the the a/c got home. The police were very quick to pass on the information. I cannot praise them highly enough.