But being an MP isn't all yelling and brown sauce; sometimes people yell back at you or throw brown sauce in your eyes. And, of course, there's the ever-present threat of that horrible queen coming by and telling you what to do. And even for more mundane issues like illness or a family personal emergency or sexual deviancy, there are other reasons why an MP might want to resign. Except that they're not allowed to.
You see, due to a 300-year-old piece of legislation (because that's just how England works), no sitting MP can resign his or her seat, unless they accept another office of profit under the Crown. Which means that the government, to accommodate the fact that MPs do sometimes need to resign, is forced to give these MPs a new "job," specifically the Steward and Bailiff of the Manor of Northstead. This is essentially a completely made-up position that exists solely to satisfy this bizarre technicality, an office with no duties or privileges or even official sauces. That that's the preferred solution instead of changing the law - which is, you know, those MPs actual jobs - should tell you an awful lot about how good they are at those jobs.