You can move your existing credit card balance to a balance transfer credit card if you’ve found one offering better interest rates. But be aware of cards that offer 0% interest on balances transferred for a number of months but then charge you for transferring your balance to the new card.
Using your card abroad: Before going abroad it could be a good idea to find a use abroad credit card that has lower charges when its used abroad. Just remember you could still be charged a foreign usage fee and incur added interest on purchases (even if you pay it off in full within the month).
If you’re given a choice of paying in pounds sterling or the local currency while overseas, always choose to pay in local currency. Opting for pounds sterling might sound like the right thing to do, but it means the exchange rate used won’t be as good as the one your credit card company will give you.