Every once in a while, you learn some funny things about the English. Like this one: members of the parliament cannot resign. Actually, in the history, MPs were sometimes elected against their will - presumably there were some occupational hazards and anyway it was financially not such an attractive job as nowadays.
OK, so when an MP has disgraced himself in the expenses scandal, how do the English get rid of him? They appoint him to the job of Crown Steward and Bailiff of the three Chiltern Hundreds of Stoke, Desborough and Burnham. This is a ceremonial position of profit. An MP accepting an office of profit under the Crown must give up his or her seat. An MP applies for the office to the Chancellor of the Exchequer, who usually then signs a warrant appointing the now former MP. And thus the MP has effectively resigned.