Just to finish up on your query InsanityBeckons, if you are willing to reverse your direction of travel, you can get the below for £1,590 on BA routing: AMS>LHR>SIN>BKK>LHR>
AMS, you'd get 420TP or using Finnair CDG>HEL>SIN>BKK>HEL>LHR for £1,690 and 440TP.

Wozza2404 seems to have found the best QR deal out of Europe at the moment if you want to try and make silver in as few trips as possible, otherwise wait and hope for the January sales!

Pilot37