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Thanks for your replies!
I'd say there would be substantially less entries for the Irish versions of M.o.S crosswords (less people on the island....) but up in the north you can buy BOTH versions (ie the Irish and UK mainland copies); the crosswords work slightly differently but I suppose you could always have a go at both....except a stamp for Dublin costs a whopping 48p nowadays, even though there's LESS distance from Antrim to Dublin than Antrim to London; but there you go.