For those who are not in the UK and are considering using Money claim online you will need a service address.
This is an address in the UK where mail is sent, then forwarded on to you.
Here is a company that you can use:
http://ukmailboxdirect.co.uk/Note, you should tell them ahead of time that you're expecting mail and would like it tracked with a tracking #. Otherwise they will not provide one.
DO NOT *RELY* ON THE POST COMING IN TIME. Instead, you should be calling in WEEKLY to the court for updates. They are super nice, and don't mind at all providing updates.
Now is a good place to mention: If you don't want to do any of this, you can use a law firm (I used them too) and they'll handle everything from start to finish for you, all for a flat fee that is most likely recoverable:
http://fightalpha.net/index.php?topic=147.0