We are flying out to bangkok on 6th August for our honeymoon and really want to use the Austrain Airlines smart bid upgrade on the flight from Vienna to Bangkok. I have searched all over the internet and cant find out anyone who has used this yet. On the website the sliding scale goes from £250 to £1400 to upgrade from economy to business class. We paid £600 each for our return tickets from London to Bangkok and have been offered the smart bid option. Right now they have business class seats on our outward flight from london to bangkok for £780 but since we got a deal we are not able to pay the extra so have to bid. Does anyone have any idea of how much we should offer. Were thinking about £400 each just for the flight from Vienna to Bangkok. Many thanks for any help.