Polling expert Sir John Curtice has weighed in on the upcoming by-election in Holborn and St Pancras, suggesting it may serve as a crucial test for Green Party leader Zack Polanski. The by-election was triggered when Sir Keir Starmer, leader of the Labour Party, stepped down as an MP to focus on new work in international affairs. This marks the first time Starmer has left his seat since becoming Labour leader, and the contest has drawn significant attention due to its potential implications for the Green Party's growing influence. Curtice compared the situation to the recent by-election in Makerfield, where Labour's Andy Burnham secured a victory. He pointed out that Holborn and St Pancras is a particularly challenging seat for the Greens, given Labour's long-standing dominance in the area. The constituency has been held by Labour since 1983, and Curtice noted that while Polanski has a chance to win, the likelihood is "probably not high." The by-election comes at a time of heightened political tension, particularly over Labour's stance on the conflict in Gaza. Opposition to the party's position on this issue could influence voter behavior, potentially affecting Labour's traditional support base. However, given the strong historical performance of Labour in the area, they remain the favorite to retain control of the seat. Despite the challenges, the by-election offers an important opportunity for the Green Party to demonstrate its appeal in a traditionally Labour stronghold. Curtice's analysis highlights the significance of the contest, not only for Polanski but also for the broader political landscape in the UK. The outcome could provide insights into shifting voter preferences and the potential for alternative parties to make gains in key constituencies.