Trunk flights on the JBs do all have codeshares, so this would include everything on LON-DOH. However, as noted unthread, creating and maintaining them is an almost entirely manual process, and BA do not have unlimited staff for this right now. So yes, there will be codeshares created eventually, but it can take time to set up. They are typically handled on a seasonal basis, not a year at once, and likewise any schedule changes will take time to trickle through.