aj, i don't think i've followed the plot completely and i wonder if you could elucidate some more.
KLM's network doesn't overlap hardly with BD's, except perhaps for LHR to AMS, and certainly not for anything eminating out of EDI. so that being the case, a switch from one programme to another would surely only be to utilise just one route that someone was flying?
Did you switch when KLM pulled out of STN? or are there other routes that i've not figured out yet?