(FILES) Britain's main opposition Labour Party leader Keir Starmer delivers a speech at the National Composites Centre at the Bristol and Bath Science Park in Bristol on January 4, 2024. Britain's main opposition Labour party on May 16, 2024 set out its stall for this year's general election, outlining six key pledges to voters in a de-facto campaign launch. Nevertheless, both Sunak, who heads the ruling Conservatives, and Labour leader Keir Starmer have switched to election mode, positioning themselves for what is looking like a protracted lead-up. (Photo by JUSTIN TALLIS / AFP) (Photo by JUSTIN TALLIS/AFP via Getty Images)

BERLIN, GERMANY - MAY 16: Cans of vegan tuna stand on display at startup company Tu-Nah at the 2024 Greentech Festival on May 16, 2024 in Berlin, Germany. The Greentech Festival is a mix of trade fair and conference bringing together companies and initiatives in the green technology sector. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MAY 16: A visitor stands among plants hanging upside down at the stand of YouTurn, a startup company seeking to strengthen biodiversity in urban environments, at the 2024 Greentech Festival on May 16, 2024 in Berlin, Germany. The Greentech Festival is a mix of trade fair and conference bringing together companies and initiatives in the green technology sector. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MAY 16: Bins filled with recycled steel, glass, plastic and aluminium that will go into the manufacturing of Audi passenger cars stand on display at the 2024 Greentech Festival on May 16, 2024 in Berlin, Germany. The Greentech Festival is a mix of trade fair and conference bringing together companies and initiatives in the green technology sector. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MAY 16: A mock-up of an Apus i-2 hydrogen fuel cell powered airplane stands on display at the 2024 Greentech Festival on May 16, 2024 in Berlin, Germany. The Greentech Festival is a mix of trade fair and conference bringing together companies and initiatives in the green technology sector. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MAY 16: An Urban Ray drone used for delivering medical products stands on display at the 2024 Greentech Festival on May 16, 2024 in Berlin, Germany. The Greentech Festival is a mix of trade fair and conference bringing together companies and initiatives in the green technology sector. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MAY 16: Visitors look at the Audi PPE electric car battery and drive platform at the 2024 Greentech Festival on May 16, 2024 in Berlin, Germany. The Greentech Festival is a mix of trade fair and conference bringing together companies and initiatives in the green technology sector. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MAY 16: A speaker gives a presentation at the 2024 Greentech Festival on May 16, 2024 in Berlin, Germany. The Greentech Festival is a mix of trade fair and conference bringing together companies and initiatives in the green technology sector. (Photo by Sean Gallup/Getty Images)