In recent months the author have been contacted by a number of clients and acquaintances asking him what to do about the same problem: they have all received invoices that they weren't expecting. In theory, any organization with good internal controls should already have mitigated against the settlement of any unsolicited invoices. But any buy-to-pay system must have its weak spots, as anyone who has ever tried to get their telephone or utility bills processed will know. A number of fake invoices purport to be something official. Perhaps the most emotive are private parking invoices. A good idea is to check the for statutory compliance. Another case involved charitable publishing. Supporting charities is A Good Thing, of course, and there are many reputable agencies out there, but it may be worth checking with the charity in question before you part with any money.