With respect to the opening poster but I believe that thoughts of a change of government at any time in the near future are wishful thinking. However, should the Covid -19 crisis produce the widespread unemployment some are predicting and that was further aggravated by a no deal outcome to the leave negotiations, then it is possible to perceive a no-confidence vote being passed in the House of Commons in such awful circumstances.
However, if one Conservative government is not to replace another in the above situation it is in reality only the Parliamentary Labour Party (PLP) that would have any chance of forming "a government of national unity" within the present elected parliament or a General Election would have to be held in an atmosphere, possibly, of great crisis. A General Election held in such an atmosphere would only benefit the extremes of left and right and therefore, I feel, would have to be avoided if at all possible.
The forgoing will mean that the Labour Party and the wider Labour movement must somehow overcome their present disagreements and once more reaffirm that one hundred years mutual support of each other. In the last few days, there would seem to be substantial movement to bring that about. In that, both Jeremy Corbyn and John McDonnell have spoken up in support of the continuation of the affiliation between the trade unions and the PLP.
The frontrunner to replace Len McCluskey as General Secretary of the Unite Union, Steve Turner, has stated that he wishes to maintain the affiliation, if at all possible, between Unite and the PLP which is crucial being that Unite are the Labour Parties largest financial donor.
Kier Starmer is now scheduled to address the TUC annual delegate conference in September. However, what Starmer states in that address may well turn out to be the most important words of his political career.
In all the foregoing, only action within the present Parliament can remove the existing government, and in that only if a majority in the House of Commons felt that action was absolutely necessary. It would then take Kier Starmer Leading a united PLP to work to form a government of national unity. A Labour Party divided within itself and financially insolvent would not suffice in carrying that out.
It also has to be considered who from within the Conservative party in the House of Commons would in such circumstances come forward to join Starmer and others in leading such a government???
And who would be Prime Minister????