在UK购物刷国内信用卡（我招行的）方便吗? should be ok 汇率是按什么来算的 usually the worst rate against you 到底是走银联通道划算还是走VISA的does it matter much? 我的卡是双通道，在刷卡的时候可以或者说需要特别跟人家说明吧 I think as long as they can get your money, it does not matter 如何说~？Usually in English, sometimes in Chinese also acceptable.
