We have booked the Sian Ka'an with Thomson and last week we called them to change our seats to extra leg room seats which cost us £180. Today I received a call from Thomson offering me Premium seats at reduced cost as they had a special deal . The price quoted was £518 for both of us return on top of the £180 already paid for the extra leg room seats. I don't claim to be Einstein but even I can manage simple calculations. £518 and the £180 we've already paid comes to £698 which is exactly how much the premium seats are on this flight today and every other day. Doh!! Thomson must think their customers are stupid?