The Aporia · Chris Mason: Questions remain for Green Party leader Zack Polanski

Story summary

The Holborn and St Pancras by-election took place on Thursday to replace former Prime Minister Keir Starmer, who had resigned from his seat in Parliament. The race is between Labour's Dani Arbid-supported candidate Fadila Halima, also known as Ms Abdi-Wali (the exact name varies across sources), and the Green Party leader Zack Polanski. This election is significant for Prime Minister Andy Burnham, who needs to restore faith in Labour among left-wing voters after its decline during the Gaza war.

The North London constituency has been a Labour stronghold since 1983, held by Frank Dobson for 32 years and Keir Starmer for 11. Polanski is hoping to break this streak and secure his seat in Parliament. However, it's noted that Polls indicate the contest between Labour’s Halima and Green Party leader Polanski is close.

Polanski has faced a difficult week after his party passed a controversial motion at its conference asserting “Zionism is racism,” though he abstained from voting on this resolution. He later stated his commitment to inclusivity, rejecting exclusion based on religious or communal affiliation.

The election also marks a critical moment for Polanski's leadership of the Green Party, which has seen significant growth, gaining over 440 councillors and control of five councils in recent local elections.

Polanski appeals to voters by arguing that a Green voice can push Labour on issues such as rent controls and putting Thames Water into public ownership. He also emphasizes the importance of voting against new drilling in the North Sea, an issue that Labour delayed addressing until after the election results.

Overall, while polls suggest a close race, it remains uncertain whether Polanski can upset the long-standing Labour dominance in this constituency.

Written for “Holborn By-election Campaigns” on 2026-10-31, grounded in this article and the 47 other(s) covering the same event.

This article reads unscored and hedges 0% of its claims. Each row says how that neighbour differs.

Polanksi on the ropes: Green Party leader is left fighting for his political future after humiliating by-election defeat Same event

Daily Mail

Hedges 3 of 31 claims Outlet record 68/100

Polanski signals Green leaders could get more power over policy amid Zionism row Different event

Evening Standard

Hedges 3 of 12 claims Outlet record 65/100

“While both articles discuss the Green Party's controversial motion regarding Zionism and questions for leader Zack Polanski, they describe different aspects of the situation occurring on separate days.”

Green Party activists plotting to oust Caroline Lucas amid fallout over 'Zionism is racism' vote Different event

Evening Standard

Hedges 1 of 11 claims Outlet record 65/100

“The articles describe different aspects related to the controversial motion but do not report on the same specific incident or time.”

Zack Polanski banned from Israel after Green Party backs 'Zionism is racism' motion Different event

Evening Standard

⚖️ Leans right Hedges 2 of 29 claims Outlet record 65/100

“While both articles discuss a controversial motion passed at the Green Party conference regarding Zionism, Article A focuses on Israel's response and Zack Polanski being banned from Israel, while Article B discusses the implications of the motion for the party leader in relation to an election defeat.”

Voters go to the polls to replace Starmer in Holborn and St Pancras by-election Different event

Evening Standard

Hedges 1 of 22 claims Outlet record 65/100

“The articles discuss different events: one is about the by-election results and leadership challenges, while the other focuses on the controversial motion passed at the party conference.”

Voters go to polls to replace Starmer in Holborn and St Pancras by-election Different event

Evening Standard

Hedges 1 of 22 claims Outlet record 65/100

“The articles describe different events: one about voters going to polls for a by-election, and another about the Green Party's defeat in that election and questions raised regarding the party leader's stance on a controversial motion.”

Polanski vows to carry on as Greens leader after by-election defeat to Labour Different event

Evening Standard

Hedges 1 of 31 claims Outlet record 65/100

“The articles describe different aspects and events: one focuses on Polanski's reaction to losing a by-election, while the other discusses potential questions about his leadership due to a controversial motion at the party conference.”

Leader of Jewish Greens calls for Zack Polanski to resign Different event

The Guardian

Hedges 0 of 23 claims Outlet record 66/100

“The articles discuss different aspects of the same policy debate, but describe distinct incidents: one questioning Polanski's stance and another calling for his resignation.”

Zack Polanski signals Green leaders need more power over policy amid furious Zionism row Different event

Evening Standard

⚖️ Leans right Hedges 3 of 10 claims Outlet record 65/100

“The articles discuss different aspects of Zack Polanski's leadership and the Green Party's internal dynamics related to Zionism, but they do not describe the exact same specific incident at the same time.”

Greens make ‘Zionism is racism’ party policy as Polanski skips vote Different event

Evening Standard

⚖️ Leans strongly left Hedges 0 of 17 claims Outlet record 65/100

“While both articles discuss the controversial 'Zionism is racism' motion at the Green Party conference, they describe different aspects and outcomes (one focuses on Polanski's absence during the vote, while the other discusses its implications after a by-election defeat).”

Chris Mason: Questions remain for Green Party leader Zack Polanski

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