That too is true and from Ireland that may well be the case. I was only really playing devils advocate. That being said if we think hypotyrtically even one step further ahead lets not forget how MOL would revel in offering the cheapest T/A "fare" on the market from a
PR perspective, and too stick one right on the big LHR/BAA establishment nose. Lest we forget MAG are going to have little choice but to be very cozy with FR in the short and medium term and would break their own backs for all new scheduled T/A services from STN in particular.
Why bother with T/A from UK when you have an immediate hit on APD of £65 when you offer fares to hub airports in countries with no APD feeding into T/A routes.
MAN-SNN then SNN-JFK where no T/A APD and clear US Immigration so no delays in JFK.