Adrian Ramsay will be the Green Co-leader with another member of parliament, Ellie Chowns, an unprecedented split in the duo's political loyalty, which means it's crucial to have a Westminster leader with a record of success in Westminster.

Ramsay, along with Carla Denyer, has been co-leaders for four years, and they were elected to parliament last year in the party’s greatest electoral victory.

Last week, Denyer revealed to Guardian that she would not recompete the leadership, but instead focused on Bristol Central Constituency and sports such as net zero and affordable housing.

Although the leadership nomination will not officially open until next month, the competition may be between Ramsey and Chows, and current deputy leader Zack Polanski has announced a bid to bring the party to what he calls the “ecological popuism” radiated by reforms.

Polanski said that in praising the achievements of the outgoing duo, he believed that the Greens should be cautious and try to imitate reforms to become a political force for the rebellion, the masses.

Ramsay and Chowns announced a joint bid for the Guardian, dismissing the inherent criticism, saying they won rural seats in July, with records of conservative-ruling seats showing they could win new supporters.

"We both won seats that were considered inseparable," Chowns said. Chowns overturned nearly 25,000 Conservative majority to win her North Herefordshire seat. Ramsay's Waveney Valley constituency on the Norfolk-Suffolk border consists of parts of the formerly conservative seats.

"We know what winning odds means. We know what building the largest, most inclusive campaign means to inspire people to take action and thus lead to political change that was previously unimaginable," she added.

Asked about Polansky's criticism, Ramsey said such results suggest that they can "give the Green Party's message to those who don't usually vote for you" rather than MPs, it's hard to lead the party.

"The reality is that MPs are setting the tone for what the Greens say on a day's issue, because they debate in parliament. There is one reason why the parties consider their leaders as members of Congress," he said.

He said that in the current "crossroads in British politics", it is more important to focus on the demand for election growth, and polls show that Westminster's voting intentions are now closely matched by the voting intentions between the five parties.

Ramsay can be seen in Polanski's coded swipe to warn against the Greens who seek to "attract your existing supporters or a specific foundation" and adds: "We're seeing with Kemi Badenoch and the conservatives what will happen if one party chooses a leader based on a leader, and what will happen, just based on a call for a specific support base."

As a new member of Congress - one of the only Greens in Parliament that never leads the party - Chowns is a member of parliament and briefly a MEP with an international development background, but also very experienced.

She said she and Ramsey would be “a very matched pair” as the leader. In the case of the previous team, Denyer is more likely to send it to a popular party TV debate than the slightly quieter Ramsay, and the Chowns appears to be in the role of Chowns.

"We both have a huge history in the Greens," she said. "We are members of Congress, so we have the credibility of people who are already at the heart of Britain's politics. I think our leaders are there every day and speak out on that critical political platform, and that's really important for the party."