The easiest way, Marc, might be to find out what the current exchange rate is for dollars and pounds (off a newspaper, or the Internet), and then put the folding money in dollars in an envelope and send it off by letter post to Nic folded inside a Christmas Card, allowing a little extra for the hassle of them having to change it at a bank, and the bank maybe making a small extra transaction charge.

All right, it might go astray - but the chances are against that happening, provided you dont put anything in the envelope that makes it look like it's got cash in it.