Emailed them yesterday asking if my delivery address was correct and they replied this morning saying everything was fine and tickets being sent out next week or so, happy days !
I'm the same as you they never asked for a delivery address so I'm assuming they'll send it to billing address but money's been took off my account so here's hoping
Go through the this link www.three.ie/football then click to get the tickets scroll down but change your profile to stayin in ireland first then you should be sorted, at delivery say you want them delivered to great Britain