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Where there is a direct service on BA, the booking engine for BAEC is particularly poor at connections. So yes, if by searching LON-DOH then DOH-South Africa and you see flights which involce a connecton at DOH greater than MCT but less than 24 hours, usually you can call up to get them on one PNR. You need do this if checked luggage is involved. This is a general point, not just for QR.