Using business lounge when transferring from business flight to economy on one ticket
I have booked a through ticket from bhx to Rep via Doha and Bkk. I booked business but Qatar said as last leg from bkk to rep it was on a flight with only economy seats and that is what I have got. This leg is on Bangkok Airwsys with has a Qatar flight number also. I know I can use a business lounge at bhx and doha. It is not clear, and I cannot get an answer from Qatar Airways, if I can use a business class lounge in bangkok bkk during my layover as I have been flying business but in bkk I am transferring to economy flight. Does anyone have any knowledge to help me?