I think most people with half a brain see a leaflet through the door with 'free inspection' on as just a salesman trying to get a lead, and get a chance to convince you, you need work doing to warrant the 'free inspection'
Exactly...who in there right mind is going to think he will go round and tell them everything is ok...
Obviously there's a catch with the free inspection...its just so he can go round and tell you it needs updating/re-wiring or whatever...
But good luck with it...