the mistake came on choosing the wrong runway for T/O
Not really the
wrong runway. From my reading of the AAIB report I took it to mean that pros and cons
were considered, and that the slight advantage of a downslope was considered just to outweigh the slight disadvantage of a tailwind.
Problem is, if you automatically choose that same runway for landing back on, those two factors are now
both disadvantageous, and the two "
slights" added together become a "
major".