Thanks. I only meant “legit” from the standpoint of tradition and practice. As to the fixed terms act, I don’t think there will be much of a problem with this snap election because of its legitimacy (in the sense I describe). The snap election isn’t merely to call an election at a time convenient to the current government.
BTW Other parliamentary governments have fixed terms and occasional snap elections. For example, Sweden has had fixed terms since the 1990s, but was going to have a snap election in 2015 because of a budget crisis (which snap election was canceled when the major parties there came to some kind of agreement).
And then again there’s Italy - they seem to have a system of fixed snap elections, every couple of months or so...