Finance campaigner marches on to set and tells Tory leader her policy to cut interest rates will only help top earners

• UK politics live – latest updates

Kemi Badenoch has faced what could be described as the stuff of nightmares for a UK politician being interviewed about a personal finance policy: being ambushed and contradicted live on air by Martin Lewis.

As the Conservative leader was being interviewed on ITV about her party’s plans to cut interest rates for some student loans, Lewis, a campaigner and finance expert, marched on to the set to announce that he completely disagreed.