Might just as well let the Lollypop lady and the check-out girl at Tesco have a snoop around the house if they come knocking,makes just as much sense as allowing an RSPCA employee entry,they all have the same legal powers,NIL If your sociable and that way inclined let them in,its your place,your call,your decision,I would rather allow the mormons in when they come doorstepping however