That could be a result of the Parliamentary style system. With multiple parties - each sharing a part of the government - proposals and alliances can shift rapidly. It all depends on how big the pie becomes for each to get a slice
Not usual, but two out of the last 20 governments is not what I would call very rare.
its more likely than it has been in a very long time with multiple smaller parties gaining seats. Nationalists in Scotland and Wales have been around a whole, and NI always had its own parties, but on top of that we now have Reform and the Greens making gains.
