SWBKCB was making the point that NCL is a long way from any reasonably sized UK additional population - 100 miles to Leeds, about 120 to Edinburgh (and that on farily grim roads)
NCL is stuck pretty much with the population of the NE - say 2.6 million people. and the socio-economics means it's not a major source/destination for business or first class passengers to a large range of destinations
on the other hand that 2.6 mm is pretty much a captive market for NCL so you can be pretty certain that your prices won't get hammered by someone undercutting (as happens bewteen Luton/Stansted; Man, Liverpool/Leeds. GLA/EDI etc)