What to do with £10 in coin in Dublin?

OP is in Dublin, as stated in the title of the post, so asking for a sterling note in exchange for the coins is unlikely to work.
Many, perhaps most, Dublin shops will actually accept sterling coins at face value in euro, i.e. take your GBP1.00 as payment to the value of €1.00. Not a very good deal for you, but if you're not going to be in the North or the UK again any time soon probably your best option.
Edited by: fear_rua
Even if the OP had a £10 note (N Irish or sterling) it would hardly be worth changing it into €s because of the commission/crap exchange rate. The OP might be able to find a friendly bar person in Dublin willing to exchage his coins for a pint - I doubt very much whether it would stretch to 3 unfortunately ;-)