Originally Posted by Duke787

From the QR website it appears you are correct that N and O class will earn you 60 tier points. If you are in need of 70 tier points, it looks like a cheap flight like LHR - BER - LHR earns 10 tier points for the lowest fare class on BA and 16 for a higher fare class.

Right now you can book a roundtrip that looks to book into "O" class (earning 16 tier points on QR) for $212 for a same day weekend turn.

That would probably be the easiest way to get the extra tier points needed to get to the next level.