Just bring a bag of money, and I'll give you best rates. Under the bridge behind Kings Cross, totally legit. Or do Ron's online thing.
I used to negotiate a great deal with the PO. There was also an exchange bureau nearby and when I asked them what was the best deal they could do she pointed to the rates board and said "That". I chuckled and said "Surely you can do better than that" and she said that she was not able to change the rates. When I told her I could get 3 points better at the PO and showed her my quote, guess what; she said "We can match that". Always negotiate
How much money are you taking Ciaran? Whenever I go on holiday I just withdraw the highest amount possible on my Visa card and get charged a minimal amount and live exchange rate. Unless you're talking thousands it's hardly worth the hassle fannying about haggling with Bureau de change brokers.
600. The Post office was next to 'The Money Shop'. I wasn't haggling, the girl in the post office told me to go to the money shop.