This means that British members, who mostly will have their own accounts use GBP, should tell their bank to do the whole transaction in EUR; in other words the conversion needs to take place on their end when the money is deducted from the member's account. That's why I'm interested how UK banks handle such transactions and in how far this results in (high?) fees for the UK bank customers.
Apart from my Australian bank accounts, I also have a UK bank account (a remnant from my time living in the UK). I found this webpage detailing the fees that NatWest (a large UK bank) charges for foreign currency transactions:
For online/telephone purchases it says: "We will charge a Foreign Purchase Fee of 2.75% of the value of the transaction (minimum £1)".
While not a huge amount, it does add to the cost of paying for an order in a currency other than the one held in the payer's bank account.
I guess it's just a cost of doing business in this international online world. If a transaction occurs involving more than one currency, someone, somewhere, will be paying a fee for it!
The upshot of this discussion is that, for me living in Australia, it makes no real difference whether my order is sent from the US or European supply store. I suspect that, for such a far-flung country, shipping costs and shipping times won't be very much different either way. My level of ordering will probably stay the same. But I acknowledge that it *will* make a difference for European Bookcrossers.