The formal warning demands written assurances from the think tank that it will not engage in further political campaigning.

Vote Leave chief Matthew Elliott, who is credited with several successful political crusades, is on the Free Market Forum's advisory board

Labour expresses concern as government defeats efforts to enshrine food safety and animal welfare standards in UK law

Trade secretary held talks with Institute for Economic Affairs that were on transparency register until being reclassified as personal.

Document criticising Theresa May's Chequers plan 'was not sufficiently balanced' and sought to influence government policy on 'an issue unrelated to the charity’s purposes', regulator finds.