she said that would probably be good and would help her but asked how they were going to find the money to do it since they said they weren't increasing taxes or cutting spending elsewhere or anything

He could easily just have said that they are supposedly planning to increase revenue by funding HMRC better, removing loopholes the wealthy use to avoid tax, and adding VAT to things like private schools to the total value of a few billion more a year.

It's a fairly prominent part of their short manifesto and general campaign, and the idea that this idiot was out campaigning without knowing it makes me think that he probably should feel stupid.