I think you'll find that the QF intra-Europe codeshare flights are either near-impossible to book or priced at a level which doesn't make sense, unless you're combining them with a long-haul BA/QF ticket or a RTW product.

For those based in the UK without travel plans during the qualifying period I would suggest three weekends away using BA, AY and IB. Or you could be slightly cleverer about it to reduce the number of trips you need to take: eg a BA return to ARN or HEL, plus an AY return ex either of those; alternatively BA to MAD + a return MAD-LIS with IB.