The price apparently is a cool £250,000 if you have it. In return you get to meet the prime minister, put your point of view forward, and ask any question.
I have only two observations to make on this:
1) No surprise. This sort of thing is inevitable with the current crop of untrustworthy politicians.
2) Personally I would not believe a single answer that he gave and talking to a floor board directly is free in my house.