Do they alternate addresses for these crosswords between Belfast and Dublin? Last week is was a Belfast address this week it is a Dublin address. It costs £1 for a stamp to post from N.Ireland
I'd guess that they print slightly different editions for each side of the border but that occasionally (either due to a mix up at the distributors or simply because of a shortage of copies for one particular side) they end up in the wrong places. (i.e. every week sees both addresses being published. If so you're free to choose whichever one is most convenient to you, even if it isn't the one printed in the newspaper that landed on your doormat).
Think there are two editions available in N.I. but I see what you mean. Don't know if you can send them all in one envelope or not?! I have an edition this week with sterling price and Euro prizes & Dublin address.