Apparently Gulf Air are currently selling very low priced tickets LHR to BKK if anyone is interested.
Book by Sept 01, 2006 Depart Sept 04, 2006 for £343 - OnlineTravel.com
Book by Sept 28, 2006 Depart Oct 01, 2006 for £361 - Thomas Cook
Book by Oct 05, 2006 Depart Oct 08, 2006 for £343 - Online Travel.com
Book by Oct 29, 2006 Depart Nov 01, 2006 for £379 - Thomas Cook
Book by Nov 28, 2006 Depart Dec 01, 2006 for £379 - Thomas Cook
Book by Dec 31, 2006 Depart Jan 03, 2007 for £343 - Online Travel.com
All this info comes from
http://www.cheapflights.co.uk/flights/Bangkok/Heathrow/