A low ranking official who follows their instructions and procedure to the letter. Often just to piss you off and to make them feel important.
Term derives from the jobsworth mantra "I can't let you do that, it's more than my job's worth".
I'm afraid that all orders must first be placed in writing with the appropriate department before being faxed in triplicate to the following numbers. Once all of the supporting documentation has been received we will then be able to instruct the pre-payment department to advance your application for purchase. etc etc