I've just had the Jehovah's Witnesses knocking on my door.. If only I lived by the sea; we Brits know what to do!

A former JW on youtube gave some good advice. If they show up at your door ask to have an elder to come speak with you. Especially if they are women they will just do what you ask since they have no authority in the church.

Once the elder shows up let them have it. It is the Elders that are made aware of and hide all the dirty secrets of the church. Hide and covered up the child abuse and the like.