Liberal Democrats celebrate Shropshire by-election win

The video begins with greetings and expressions of excitement despite being sleep-deprived. The speaker acknowledges the absence of Ed Davey and wishes him well. They celebrate Helen's achievement in overturning a significant majority in Northrup, highlighting the increase in female representation. The video includes a symbolic act of bursting Boris's bubble. Finally, Tim Farron, a former leader of the Liberal Democrats, is introduced to the audience.

What was the significance of the phrase 'bursting Boris's bubble'?

Who did the speaker mention as a former leader of the Liberal Democrats?