@Orangesandlemons77
So I think the jist of it is -
Labour have tabled a motion to get debate time for a bill to ban fracking.
Conservatives oppose this & will vote no.
Conservatives have chosen to make it a 3 line whip (test of loyalty) ie vote with us or lose the whip.
If the Government fails then it could be said that they no longer retain the confidence of their party/Legislature and can not govern.
No idea whether they'd have to resign or a formal no confidence vote required.
If you lose the Whip you are no longer within your party, lose their patronage and can't participate in internal matters (like sending in your letter to the 1922).