hello acorns
seen another option as you prefer not to travel singapore airlines with ebookers.
thai airways dept lhr, 16/2, 11:50 arr. bangkok 06:10, dept bkk 07:45 arr. per 16:40 17/2
.................. dept per. 16:45 arr. bkk 22:45, dept bkk 01:10 arr lhr 07:15 2/4
the price is £ 745.95 total cost inclusive of taxes.
as for waiting until the last minute, i did a search as an example only for travel 14th jan and return 1st march, there is availability and the price is around the £745 mark same as the above. my thoughts are i would book it sooner rather than later and be safe in the fact that you have a booking. also your departure is only 1 mth away. lets say the worst case scenerio happened and the availability wasn't great or not on the days you prefer? you would be kicking yourself.
i expect there would be flights available but would they also be priced about £745? who knows.
i dont think you would get it much cheaper.
just found qantas from heathrow (opodo) £761 via singapore on your travel dates.
regards
jim