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Boris was elected to deliver Brexit - whilst I think it a foolish decision and poorly executed, he was utterly clear about his intentions if elected in 2019.
So you think that in spite of everything, that on our behalf, he
should have made a foolish decision, poorly executed?
He was also expected to exercise judgement about the details of what was being delivered and making final decisions based on the final deal, even if that meant cancelling the whole process.
Similarly Sadiq was equally clear in his 2021 manifesto that he intended to expand ULEZ to take in all London boroughs.
He is also expected to adjust policy based on what is known and the outcome, and seems to be doing exactly that. Well done Sadiq, ignore the howling mob!
They are both under the same obligation; to assess the viability of any proposed course of action and to adjust accordingly.
Save for major unforeseen events, major policy changes or legislation not promised in the manifesto is a denial of democracy and unacceptable.
More likely to be error of judgment in the first place, impossible ambition etc. and change of plan accordingly.
What was seriously wrong about recent history was blindly to go ahead and "Get Brexit Done" in spite of there being no deal on paper, many questions unanswered, many doubts about the whole project.
We elect representatives to use their judgement, to act on our behalf, not merely to obey the mob. If the latter we would not need MPs we could just instruct the civil service by plebiscite or other means. We would not need judges and legal processes either.
Johnson failed in his basic duty to act in the bests interests of the electorate, he was not delegated to blindly obey their instructions whatever the outcome.