Well technically... you left out an important word after "offer": > a written offer, valid for at least three ... So it's not just requiring an offer be made

Well technically... you left out an important word after "offer": > a written offer, valid for at least three ... So it's not just requiring an offer be made, it's requiring a offer being made which is valid (with certain conditions) If you make an offer you have no intention of honouring, surely that's not a valid offer?