I think in some cases there has to be a distinction. One controversial one might be, should an MP be allowed to participate in other outside activities while he's an MP? I think most MPs would probably say yes. The code is developed by MPs for themselves. There may be some who would say, no, you shouldn't be allowed to do anything except be an MP. That's a controversial issue, perhaps, but it's one that you can understand, because your longevity is perhaps less certain than certain public office holders—not yours particularly.
On October 5th, 2010. See this statement in context.