Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
Explanation: PO stands for postal order, and is a valid method of payment for those without a chequebook. It is not used as frequently nowadays though, mainly because a £30 postal order might cost you £35 (not joking, they cost more than their face value).