Floyd was subsequently fingered as a possible contributor to the energy
of the group of three shallow-wave depressions, then in mid-Atlantic, one
of which eventually became the Great Storm. But that doesn't add up
either, and Floyd is not mentioned in the scientific part of the Met Office
internal enquiry. At 00z on the 14th Floyd was about 1000km southwest
of the actual area of interest.

Philip
Hoskins and Berrisford in the special issue of Weather attribute part
of the tropopause anomaly associated with the storm to outflow from
Floyd.
Air from the top of Floyd would have had ~0 PV, at ~100 hPA and be
carried across the Atlantic on the 100 Kt 200 hPa jet. This would have
merged with a poleward anomaly to create a marked tropopause 'jump'
regards
David