Re flynas, have to agree with LAX_LHR on this, and the same source on another site gave the outbound load as only 10.
I don't know what vehicles the airline is selling tickets through or how much advertising of the route there has been over there. I wonder what the early loads on LGW were like - although they don't have direct competition as far as I know, there are of course flights to LHR.
The early outbound loads on Saudia from MAN were reportedly very good but inbound loads were much thinner but better than flynas. I seem to recall a figure as low as 23 but a couple of others over 50.