Gordon Brown was NEVER actually elected (PM) though was he!
You're missing the point, as usual!!
Labour weren't re-elected because of their performance. Shocked! The decision makers weren't re-elected... kinda runs contrary to your post that decision makers having to be elected, or kicked out.
And if you add in votes of no confidence and govts only lasting a few months/years... decision makers are booted out and no re-elected.