Hi folks, now that my 3 continent Oneworld Explorer ex-BUD plans for next year are in full swing, one final question remains- which frequent flyer program do I put the miles and tier credit into?! (I will be flying around 40,000 base miles in D class).

Since I live in the UK and will definitely be flying more than 4 segments with BA and will easily qualify for silver (OW sapphire), the UK Exec Club seems a logical choice.

BA Exec Club (UK) gives double miles for flying in Club. So obviously on my BA flights, I will earn double miles. However, will I earn double BA miles for my flights on CX and QF? (that would give me a nice 80,000 miles in total!)
Or when flying CX or QF,will I earn miles for my BA account at CX's and QF's lowly business class rate of 1.25X actual miles flown?
Now I would end up with around 55,000 miles(mixture of BA at 2X and CX,QF at 1.25X)