What to know

• An undercover sting by journalists posing as a wealthy American backer and his son was broadcast hours before the anti-immigration party's annual conference.S1
• Farage’s speech risks being overshadowed by allegations that Reform breached political donation rules by having polling paid for by an overseas company.S2
• Nigel Farage will make his keynote speech at Reform UK's conference - follow liveS3
• Nigel Farage’s party is accused of taking payment from an American front for polling it commissioned.S4
• The Reform leader is expected to make his speech to the party faithful in Birmingham on Friday.S5