How do you send a fax to the United Kingdom from the United stateS?

I did this yesterday.

Literally walk into the post office and say to the person behind the counter "can I send these to the USA please" give the letter(S) to them and they'll put on an airmail sticker and stamp then charge you and send it. (3 letters cost £2.01) Obviously you have to have an address, name, State and zip code etc.