title: how to set GBP as default currency for US customers in magento?
body: <p>I have a magento store with multiple currencies. The product prices are displayed in the relevant currencies according to the IP addresses. 
  I want to set up GBP as the default currency for US customers, i.e. instead of USD (as per the ip address) the prices should be displayed in GBP for US clients.</p>
  
  <p>I am new to magento, any help will be appreciated.</p>