FRASTN.
Re your "It's not that there's not enough demand for long-haul from STN believe me!"
Absolutely !
The problem and its a major one, is that STN has been unable to get business travellers to travel to STN in large numbers for the long haul full fare airlines.
Just ask American Airlines for one, who tried it twice !
Not sure how you change that unless the UK Govt forces those airlines out of LHR into STN.
Nigel