u can sell Euro in Poland and u will get better exchange rate than here,even sell euro buy pounds in Poland still better off
but dont do above right on the border coz there is lowest rate
I'm with HSBC they never charged me when I was buying something only charge was when I had to withdraw from ATM
it's not worth to buy polish money here in UK better exchange there if any of you will buy polish money for 100£ it will be more than enough to get on site and pay camping fee and we can change money in poland, pound value still slowly growing against zloty