Hi malpes,
Thank you very much for your thorough reply. I was indeed beginning to suspect that there was no need to declare it, since, despite some effort searching, I couldn't find any appropriate forms or mentions of having to do so in tax guides about moving to Ireland. I suppose it makes sense, but, since there is so much fuss about offshore bank accounts I thought that maybe I had to. Unfortunately in my situation I don't think I could easily claim that I am not domiciled in Ireland so I will declare the interest from the accounts on Form 11. I also wrote to the Revenue about this using myEnquiries more than one month ago, but haven't received a reply yet. I'll post an update here if they do eventually reply.