You are talking ****** mate ,the UK didn't renege on anything ,the UK government derives its authority from Parliament and not the other way around as you seem to think.
Any agreement between the representatives of the UK government and the EU has to be ratified by Parliament.
In this case Parliament was unhappy with the deal negotiated by the government and refused to endorse it.
So why did the government have to be taken to court to stop them acting as if the opposite were true?
Why did the government not involve Parliament in shaping a deal which we would then try to negotiate?
That would be a fair assessment.
Perhaps you'd like to consider the difference between the engagement of the EU negotiators with the 27 other country's parliaments during the negotiations and that of our negotiators with our parliament when thinking how likely an event that would have been.
Vinty, I think you are mistaking the power of the executive (i.e. the government in power) with that of parliament.
Parliament's role is to scrutinise², agree, or
attempt to amend, or
discard³ the arguments (laws, decisions etc) of the executive.
Government decides the order of business in the HoC, it owns the control of that business and the amount of time allowed for discussion (due to formalities such as amount of business to be discussed and the formal voting appointed time)
The only exception to this 'control' of business is Private Members bills, but even they are strictly controlled and time limited.
Amendments to the executive's bills can be tabled, but if the government commands a majority and the whips are involved the chance of amendments being successful is also limited. (not forgetting that 45% of government MPs are on the payroll, and either must vote with the executive or resign.)
Private members bills are one of the tiny differences between the EU parliament and the UK parliament.
The often quoted comment about EU parliament being unable to present new legislation, only the Executive can present new legislation, pretty much mirrors that of UK parliament, except, and only for the Private Members bills allowed in UK parliament which I have already shown are extremely limited, in scope, in time allowed,in number, and in chance of success.
What was challenged in the Gina Miller case was the power of the executive to make decisions without the agreement and scrutiny of Parliament.
But the decision in her favour did not remove the control of power from the executive.
This extract gives a flavour of the power and control of the executive over Parliament. It contains much more explanation.
Convention says that parliament’s ability to stop the prime minister is heavily constrained, not least by its inability to table the necessary legislation.
Parliament has little or no power to direct government without the support or connivance of the executive.
It is on this point the Brexit problem is now playing out. At the centre of this is the question of the government’s control over business that is conducted in parliament. The government has had almost exclusive possession of this control since the 1880s,
UK politicians and observers will of course debate whether it is appropriate to change the rules that govern parliament in order to advance a single issue. The last time standing orders were amended entailed a lengthy consideration by parliament’s procedure committee and extensive debate on the floor of the Commons
Given the situation MPs presently find themselves in,
it is probably inevitable that an assessment of the government’s dominance over business in the Commons would eventually be considered. Conducting that assessment under the intense time and political pressures of Brexit may not be ideal. But it is those same tensions that are encouraging some MPs to argue that now is the time for constitutional innovation.
https://www.global-counsel.co.uk/analysis/insight/can-uk-parliament-take-control-brexit
I think the Robin Cook attempt to change Parliament (sitting hours and Lords composition) took years and the only real change was to the sitting hours)
² the ability to scrutinise is dependent on the government tabling, scheduling and allowing time for debate. That schedule is under the control of the executive. (the Leader of the House - Andrea Ledsom https://www.gov.uk/government/ministers/leader-of-the-house-of-commons )
³ attempt to amend, or discard is entirely dependable on the majority of the government in Parliament.