If Paddy got £3.30/kg and you have 10kg, that's £33 by my reckoning, which is £30 more than the few quid indicated in the previous post. The (time consuming) alternative is to go through them all, and pick out the ones you think might realistically sell for more than the nominal 3p per coin after costs and put them on ebay. They will be in good company there as they will blend in quite nicely with the mountains of crap already listed. Dealers would happily take them if there was a good premium to be made over scrap - but usually there isn't.