Sure, but even with a minority government, the test was that the minority PM could “command a majority in the House” i.e. the PM could reliably get the major pieces of legislation through the House. Formerly, if a government lost major votes that were part of its basic policy or election manifesto, that meant that the government either resigned or called an election.
The Cameron-Clegg “reforms” have changed that. PM May could not get the most important piece of legislation in her government’s agenda through the House. It got defeated three times. Before Cameron-Clegg, that first vote would have been a confidence measure, the government would have been defeated, and May would have had to resign or call an election. Instead, she stayed in power - a minority government that could not command a majority on the most important issue of the day.
And now, PM Boris has just been defeated in the Commons by the passage of the “Delay Brexit” bill or resolution (not sure exactly what form it took). A significant number of his own party deserted him, including heavyweights in the party and despite a heavy whip. He does not command a majority in the Commons, and under the traditional rules, he should resign or call an election.
But being defeated on the centrepiece of his government’s policy towards the most pressing issue of the day doesn’t trigger a resignation or an election, under Cameron-Clegg. The Opposition now controls confidence votes and whether an election will occur, thanks to the Fixed Terms Parliament Act. They can defeat with impunity, and the PM’s own party can turn on him, yet he stays PM…That is a fundamental change in the British Constitution.
Another potential example is that Britain could now experience the failure to pass budgets and a government shutdown, just like in the US. We used to say that was impossible in a Westminster parliamentary system, because if the government was defeated on its budget, it either resigned or went to the polls (Wilson in 1976; Clark in Canada in 1980). But now, the Opposition can defeat the budget and it won’t be a confidence measure. And the government in that situation won’t be able to call an election, even if it wanted to, because if the Opposition has the votes to defeat the budget without calling it a confidence measure, the Opposition also has the votes votes to deny the election. The PM and government can be defeated on a budget, but can’t call an election to let the people decide, and it doesn’t have to resign.
The Cameron-Clegg reforms have fundamentally altered the British constitution. Frankly, I don’t think theWestminster Parliament is still an example of the Westminster parliamentary system. It is fundamentally different.