Nine right-wing organisations including think tanks pushing disinformation about climate change have been accused of mounting a coordinated campaign to push for a hard Brexit, according to court documents.

Whistleblower Shahmir Sanni, formerly of youth campaign group BeLeave, claims that think tanks and campaign groups held regular meeting at 55 Tufton Street — an office close to Westminster and home to the climate science denial group the Global Warming Policy Foundation — to “agree on a single set of right-wing talking points” and “securing more exposure to the public”.

Some of the topics discussed allegedly included “new policy announcement by the Labour Party, developments in the Brexit negotiations, or any other political news story”.

The accusations were made in documents from an employment tribunal setting out Sanni’s case  against pressure group the TaxPayers’ Alliance, which he has accused of unfair dismissal after he spoke out about illegal behaviour at Vote Leave, the official pro-Brexit campaign group.