Thanks, that is reassuring.You should be able to through check your bags both times because your flights are in the same ticket and the transit is less than 24 hours in any one airport. You will need to retain your luggage receipts and you may not get the boarding passes all at once, in which case the transit deals will ask to see those luggage checks.
If it is reassuring, I through checked luggage AMM-LHR-HEL-DEL-MEL using three different airlines (RJ, AY and QF) with long transits and the overall journey spreading over four days
So just to confirm, even though on the Qantas online booking section it lists Flight 1 as BKK-AMM with RJ, and then Flight 2 as AMM-LHR-CPH with BA, I should be ok to get bags checked all the way through to the end destination?

