And like I said above Iggy you will pay 1.75% charge on exchange rate using CC. I was also trying to point out that when dealing with a reputable garage you can do your haggling first, then agree to pay them using someone like currency.ie (best exchange rate I found) and if you were not happy upon inspection they send the money back to currency.ie and on back to you. I was told by their office that they do this all the time.
OR - if you are able to spend a couple of days in the UK you could set yourself up with someone like currency.ie beforehand and when you are ready to buy you can pay€15 for a same day transfer, you just need the acc + bank of seller then phone it in to them. This must be done before 11am to get there before close of business. You can even haggle money transfer fcompany or a better rate.