Originally Posted by
FlightDetective
No, because you need to be flying QR on your DOH-LHR flight to access Al Safwa. The fact you're flying BA means the access that would have been granted by your BAH-DOH being in First Class is no longer valid due to you flying BA.
In future, you will need to remember to be flying QR out of DOH as well.
Unless you have the QR code on the BA metal. Also not too bad to enjoy a somewhat underwhelming jacuzzi at the LHR arrival lounge tho.