Originally Posted by
hansyuwiwb
You can do this in either direction, on separate or same PNRs. No problem at all. I’ve done this multiple times on Chinese passport which has the same UK rules for transit as for Indian passports.
the only exception is Qatar - QR will refuse to board you if you cannot enter the last destination on QR ticketed point as a final destination. As long as you don’t fly QR you are good.
And I can assure you that whilst airlines might consider other separate tickets in their assessment of whether you have the right to enter your immediate ticketed destination or your separately ticketed final destination, contracturallly they only have to consider the journey you have presented on the ticket that they are operating. Anything else is a customer service gesture or possibly a customer policy.
I can also say having travelled with a Chinese national that Qatar have considered onward travel ticketed with BA when their own ticket ended at LHR. But that is a published Qatar policy.
YMMV.