It is interesting that many of these new routes which have popped up at Gatwick are not 'traditional' leisure destinations i.e Beach... Costa Rica, although does have a beach market is more about the wildlife, and Lima is also more adventure... The reintroduction of New York, and the addition of Oakland and Fort Lauderdale as a direct competition to Norwegian.
Those traditional beach routes are being mopped up by Thomson/TUI, even with BA pushing the holidays component hard - so its not just Norwegian they are competing against. TUI are now introducing Sri Lanka (which BA dropped at the Maldives tag), in addition to the new Mauritius route...