https://www.google.fr/flights/#flt=L...;sc:b;sd:1;t:f

Haven't tried other dates but you can book LHR-DOH-HKG for later this year (first segment on BA, QR ticketed) for £1500. Try clicking a few dates you want as they came up as £2100 until I actually selected them.

This HKG fare seems to have been around for a while, which especially out of London is strange for QR at the moment given the lack of sales.