I think it was genuine. Also one of the people was on a Radio show that afternoon, and although I didn't hear it, I believe it was presented as fact. While it would initially seem very naive, in their defence you need to take into account some relevant facts. 1. The people taken in wanted to believe they had been chosen to take part. All doubts would be banished by this. 2. They had no real way of assessing the credibility of the "scam". They took part in a selection process, and were sent letters from a TV production company. 3. Why should they have any doubts? Why should it not be genuine? 4. The perpetrator had nothing to gain from the hoax. Having said all that, they were still pretty stupid! The folly of the desire to be famous at all costs.