Your Site Manager takes 2-3 calls each week from organisations keen to extend the insurance cover on his white goods (washing machine, dryer, fridge-freezer etc).  When he asks for details of the makes of these items, the caller invariably guesses wrongly, as this is clearly a form of scam trying to trick people into taking out worthless and unnecessary insurance policies.

The first question is ask is probably for them to tell you the make of your washing machine etc.  In the unlikely event they get it right you have two choices.  Put the phone down or let them talk.  But whatever you do, the best advice (from your Site Manager) is not to tell them the make of any of your equipment, as next time they will get it right and may convince you to co-operate with them.