British Airways owner IAG led the list of buyers last year, analysis shows.

A climate scientist said the news that Samuele Furfari, a former EU energy advisor, had joined the Global Warming Policy Foundation showed the organisation was “clutching at straws to defend its fringe and unfounded views”.

Patrick Minford is a fellow at the Centre for Brexit Policy and led Economists for Free Trade, both of which have strong ties to the Global Warming Policy Foundation.

Steve Baker, who ran Suella Braverman’s failed Conservative leadership campaign and now supports Liz Truss, had the £2,000 ticket covered by Brexit Party donor Christopher Harborne.

MPs are whittling down the list of candidates for the next PM – but few are green champions.

Suella Braverman, Penny Mordaunt and Jeremy Hunt are also among Conservative party leadership candidates with direct or indirect links to the Global Warming Policy Foundation.

Advocates of climate action fear Conservative Way Forward's relaunch will galvanise the right-wing campaign being waged against Britain’s net-zero efforts.

Anti-fuel duty campaigner Howard Cox, who has downplayed “alleged man-made causes” of climate change, backed drivers who targeted roads across the UK.

The unsubstantiated claim has resurfaced in recent months as pressure has grown for the UK to embrace the controversial gas extraction technique.

Michael Hintze, an Australian hedge fund manager, will join several other climate sceptics in the House of Lords.