John wrote three letters to his three main local competitors announcing he would sell his business to either one of them who offered him, in writing, the highest price. He also stated he must hear from them, if interested, before 5 pm on Monday 22^nd March. He posted these three letters on Monday 8^th March.

Mark received his letter on Thursday 11^th March and telephoned that night to discuss the sale with Fred. The call went through to the message bank so Mark left a message saying 'Call me, as I am happy to buy your business', and left his name and phone number. John called him back on Sunday afternoon and Mark specified a price at which he would be prepared to buy the business. John said he would think about it and get back to him.

Does this mean Marks offer wont be accepted since John said the offer needs to be in writing.