Still, my point stands. George V could not interfere with any decision the British Government made.
Yes, like Ann says the British (and other parliamentary constitutions) go into meltdown mode when the monarch goes against his own cabinet. (How different that is in the US!)
But it's interesting to consider the fine nuances between different levels of parliamentary government. One can very well imagine Queen Wilhelmina risking a constitutional crisis in order to do "the right thing" and grant Wilhelm II asylum, even though the Netherlands had parliamentary government ever since the Luxembourg Question in 1867. (Indeed there was a political crisis, with the Socialist Troelstra calling for a revolution and the abolition of the monarchy, just like in Germany.)
Ann, I have read that you are a constitutional jurist, what happens if the monarch, as the safeguard of the people's right to express their will independently of the political establishment, wants to dssolve parliament and call for new elections, but a prime minister, clinging to power and a dwindling majority, advices against it?