I would 'phone them. There are 3 potential charges they could make. A commission charge of a % with a minimum charge. An interest charge on cash drawings. A foreign exchange charge in addition to the exchange rate. I know what they say, but, although they make the same promise on their credit cards, there are still charges in other ways. They may have other fiendish charges that they don't publicise.
I use Credit cards abroad, and keep them paid up. It is interesting to use different cards from different banks. A comparison of what you finish up with as the full cost, shows remarkable differences. At the moment, I find that a Mastercard works out over £3 cheaper to obtain Cash of €400 than my Visa card. Of course, that can easily change. It is a bit of a lottery I'm afraid. Finally, I should add that we have tried using our Debit cards (Maestro) and, amazingly find these are the most expensive to use abroad.
Whatever you do, don't make the mistake of trying Travellers Cheques. They are a pain, you need an open bank, and face long queues and passport showing etc. and the rate of exchange is the Tourist Rate, whereas using a card you get the commercial rate which is usually much better. Cash, of course, is too dangerous.