ASKED in Japan whether she intends to stand down as leader of the Conservative Party in 2019 Theresa May replied that, on the contrary, she plans to lead her party into the next election, which, according to the Fixed-term Parliaments Act, will occur in 2022. Her answer sent gales of despair through the Conservative Party, gusts of joy through Labour, and blasts of amazement through the commentariat. But what does it actually mean?