I would have thought that most people will be impressed by the 10% increase in International passengers in Dec, in spite of a cull by FR of some routes for the winter. Only a few years ago EDI was primarily a domestic airport in winter.
As far as TA flights go, I would have been looking not for new routes but for a longer season on most, and upsizing on the NY flights. Without Norwegian, TA capacity in S19 was much the same as in S18, and load factors/fares were high with much business transiting via Dublin or other hubs to save money.