Luckily for me Bigsmith Towers is equiped with a large forward facing bay window, so (during the hours of daylight at least) i can see the buggers coming. This gives me the time to dust off and cue up a bit of good old death metal - something like Venom or Cradle of Filth - strip to my underpants and answer the door with can of Stella in hand. They don't stay long....
What's their success rate like, I wonder? It strikes me that anyone vulnerable to this sort of thing would have succumbed years ago, and then would sell out to the Mormons and so on as each came round in turn. If their success rate truly is zero, WHY DO THEY WASTE EVERYBODY'S TIME DOING IT!?
I've often wondered about that myself, Simons Mith. After all, if my forebears are to be believed, even the tramps used have a 'secret' code which they scribed before someone's dwelling to indicate 'Probable', 'Possible', 'Unlikely' and 'Don't go in there the dog will eat your balls and dump your remains in the bin'. Then again, most tramps are probably better organised (and intelligent?) than those of whom we speak.