Poi,
Steve from Wargame Vault here.
Our system for non-US Dollar currency is imperfect I regret.
When you browse the site in GBP, when you check-out, if you choose to pay via Paypal, you will be charged exactly the price in GBP that you saw on site while browsing. Regardless of whether you pay by credit card and use Paypal to process it or pay from your own Paypal account. Your charge will come through to you as GBP for that amount.
If you choose to pay for an order directly with your own credit card, then we use our credit card processor who only handles USD transactions, so we are forced to convert your order back from GBP to USD and give you that warning message that you read. Your charge will come through to you as a USD charge and be converted by your bank to GBP at a rate which we cannot know or control.
Also, we operate both RPGNow and Wargame Vault, so the processing is actually the same on both sites (and your customer account on one site works on the other as well).
Sorry for the confusion this causes. We know it's imperfect, but we aren't quite a large enough operation yet to justify taking on card processing in GBP and EUR yet.
Steve
Wargame Vault