Hi all, I'm eye-ing a business class OTA ticket for a QR flight which is codeshared with BA (SIN-DOH-LHR return) where the following applies.

- SIN-DOH has a BA number and is operated by QR.
- DOH-LHR-DOH flights are operated by BA and have a BA number
- DOH-SIN number has a QR number and is operated by QR.

Any guidance on whether I have al mourjan / al safwa lounge access in Doha with my QRPC Platinum membership on these ticket types?
Data point which I'm not sure is relevant, in the OTA flow (booking.com) it's giving me free seat selection on the QR flights and paid seat selection on BA (which I guess I can avoid by later selecting this with my OWE number on BA).
There's no way to see the full fare rules it seems or the fare class.
I'd usually avoid going through an OTA but the price difference is too much to ignore.