Buying something from Polish site using an UK based Santander debit card

Hi folks

I want to buy something from a Polish site using my UK based Santander debit card. Obviously the currency is in zloty so there will need to be a conversion made. Will Santander make the conversion when I make the purchase, because it's 86 zloty with postage and packaging and I don't want them to give away £86 by mistake?

Also, I assume if they to make a conversion they will charge me a fee [I think I remember reading 2.75% of the sum].

I'm a bit apprehensive, I don't remember buying anything in a foreign currency from a website before.

This isn't exactly your situation, but I used my Santander debit card in Poland last month to pay my hotel bill.
Obviously the currency was in Zloty, but it showed up in my bank account in Sterling so the conversion should be automatic.
I know you would be purchasing in the UK, but principle is the same.


That's what I was charged, plus £1.25 non sterling purchase fee.

It looks like PayPal [that I used] did the conversion without my bank having to do it, so hopefully I won't be charged anything.