Hmmm. You might be a bit premature there, governments do lose safe seats in by-elections. My True-Blue father-in-law still talks about the time he voted for Eric Lubbock in 1962 when the Liberals won the safe Tory seat of Orpington.
Still, yes it is good news. If the Tories had held on in spite of everything then I really would have despaired.
Brought the govt down did it not? I live in the town and they still talk about it.