Mike,
I'm sure BE might do well on NCL to BHX, as I have heard that T3 have reliability issues on this route, and some pax loads which could, well, fit in a car!
Looking at the success EZ have shown on their BRS to NCL, and the level of competition on BHX to EDI, with more realistic pricing, BE should be able to sustain 2 or 3 daily rotations, especially if they were to offer onward connections, which they were previously trying to suggest people might want to do through their EXT to CDG route!
It would certainly be more viable than the run they used to do from BHX to EXT.