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They can only do that if 2/3 of the HoC votes for it. This changed with the FTPA.
The opposition are unlikely to vote for it if it's going to allow the Tories to move from minority to majority.
The opposition may go for it if they think it's another bad call and they can inflict further damage on the Tories...
Greenbank-
They can only do that if 2/3 of the HoC votes for it. This changed with the FTPA.
"However, Prime Minister Theresa May announced at the Conservative Party manifesto launch for the 2017 general election that they intend to repeal the Act."
https://en.wikipedia.org/wiki/Fixed-term_Parliaments_Act_2011 -
Also, it's only 2/3rds for a motion for an Early Election.
A motion of "No Confidence in the Government" only needs a simple majority and would result in an early election automatically if there wasn't a countering motion of Confidence within 2 weeks of the NC motion.
Emyr
The other option is to call an election when they think they have sufficient support to gain an outright majority. This is what Macmillian did during his leadership and went from a minority to a 3 seat majority.