Questions spring to mind:
Did the police in the car which turned opposite the house, do so because they wanted to check out who had made the phone call? ("Ve are votching you. Ve know vhere you live!")
Did they know that the car had been sitting there for three weeks before my phonecall?
Did they care?
Am I becoming one of those paranoid, nosey neighbour types with too much time on my hands?
And the biggest one:
WHY was an empty police car sitting in our road for three weeks???
Are they going to tell me? No!