I had a Focus of about that age. There was a way of making a third key. IIRC you had to purchase a blank, get it cut and then using the ignition lock and the other two, programme the chip in the new one.

I think you're stuffed unless you've already got two keys.

There are a few shops on ebay that supply blank replacement keys and will cut them if given the specific key T-number. There are also other shops that will supply a blank transponder chip. I have read in various places on t'interwebz that is possible to reprogramme the chip yourself, some say you need 2 keys, some say it is possible with only 1, so was wondering if anyone had any experience in this?
Also, as I live in the Channel Islands, there is no local Timpsons, but the local equivalent quoted me £140.