Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)

"It is not a YQ fare component we are talking about here. It is YR."

That is true, but of no import to the instant discussion. Whether YQ, YR, or both, BAEC will pass it on to the BAEC member on Avios redemptions. Carrier-imposed surcharges, whether denominated "fuel surcharges" or something else, are passed along.

"Can you point me to something that says BA passes along all carrier fees?"

I can't, but I think that it's been deduced by looking at what BA charges on various redemptions (other than RFS redemptions), and comparing those charges to the YQ/YR fees (if any) on the operating carrier's cash tickets. If you can provide any counter-examples, I'm sure we would all be interested in learning of them.