I wonder will they ever consider opening a mainland europe base .
Well, they have to diversify their risk. Should they want to grow and stay sustainable they need to get out of Ireland. I'd say they'll set up a couple in Britain before even considering mainland Europe. I think Edinburgh/Glasgow and Manchester could be possibilities... I think a good foundation in Gatwick and one other aiport at least before taking more risks in setting up more bases....
Also, it might be good to consider a domestic route from Gatwick in Britain such as the North of Scotland - Aberdeen...