Join Date: Sep 2006
Location: Bangkok, Thailand / Cambridge, UK
Programs: TG -*Gold, AF-Silver, Asia Miles, BA-Silver, AMEX Green-MR
Posts: 324
It depends on when you book your flight and how full the flight is. TG uses many different fares on its online booking system (from the deep-discounted to full fare). The 2,200 extra quids is likely to come from the higher fare from the (LHR-BKK route).