Northern Ireland is a part of the UK and next day delivery should be made possible. The checkout system is slightly confusing when trying to set delivery preferences once you have been told the current delivery option is not available. Free items are removed from your basket without any notification is next day delivery is not available. User should be given the option to remove item or pay price. Good UX makes happy customers :) I do like the low prices and general layout of the site. Been told that the next day delivery is awesome but sad its not available here. Happy Christmas!