He has joined forces with the international pressure group Action on World Health (AWH), which on Monday launches a campaign to reform the WHO.

AWH says the WHO has repeatedly failed to protect the public, by wrongly insisting in January 2020 that there was no human to human transmission of Covid-19 and by proving ineffective during the 2014-16 Ebola outbreak in West Africa and the 2003 Sars outbreak in East Asia.

The group also wants to slash the WHO’s budget of £5.5 billion, mostly funded by the US, the UK and the EU, and prevent “mission creep” if and when the WHO uses future Cop climate conferences to make changes to the treaty behind closed doors.

Mr Farage said: “Let’s have a proper debate about what the WHO is for. 

“We don’t want this treaty to be signed, we think the WHO should go back to first principles.

“We’re more than happy to have an early warning system for a pandemic and we are happy to help other countries but we will do it all on a cooperative basis, and if that doesn’t happen we should say we’re very sorry, it’s not for us.”