Thanks Scottie Dog yep that makes more sense!
Regarding what those pax would have done if the service wasn't available is the key question really.
I suspect KLM would probably have done slightly better as JET2 have reduced their CDG operation and timings are not great for onward. The proportion travelling to LHR via the train I suspect is small.
BA are far from cheap from LBA to join their Long Haul although the convienience may sway a few, but I know a few who looked at their prices then decided to use KLM via AMS or EK from MAN.
I just hope they can make it work....Time will tell.