Welcome to the FAQ website covering document topics in Canada.
I need to apply for my U.K. Work Visa but my passport expired August 2nd. I live in America and I was wondering if there is anyway to expedite the process by mail. When I read, it said even if I fly up to Toronto they will not expedite the process unless I have proof of travel which is confusing because I can not book my plane ticket until I have my work visa for the UK.
You cannot expedite your passport by mail. Also, they are correct in stating you need proof of travel to expedite in person. One option is you can buy a ticket, show it to them, and then cancel it, or change it.