How is outright leiing to get elected is not a crisis of democracy... Saying and then doing another thing to the extent the Tories wanted to do is a democratic crisis in itself.
It's not a constitutional crisis when it was clear constitutional.
The 2012 Reform Bill died because backbenchers of both Tories and Labour co-operated to kill it - and it was Ed Miliband who led the vote against the Programme Motion. There was no way it would make it out of the Commons, and would simply take up massive amounts of parliamentary time. Putting aside time to argue over Lords reform at the expense of legislation about jobs, housing, and health doesn't look good to the public, so the Government did the sensible thing and killed it.
Good thing, too, it was a terrible Bill and would have caused massive damage to the Constitution if it had passed.
So, is this Regulation on tax credits a financial matter or not? The overwhelming consensus of constitutional experts is that it is not. Firstly, the Parliament Acts do not apply to secondary legislation (this was NOT a Bill); secondly, even if they did, the Parliament Acts require that the Speaker of the Commons certify such a thing as financial in nature before the provisions of the Parliament Act to do with financial legislation can apply. The Speaker did not do this, therefore it is not financial. Furthermore, the Tax Credits Act 2002 was not declared a money Bill by the Speaker either, so the Government is wrong any way you spin it.