Derren Brown to predict Wednesdays Lotto result.

[Frank]

Well as I expected, the programme telling us how he did it was a load of flim flam. Just a smokescreen. Before the draw date he conned a group of 24 people into thinking that they could guess the lotto numbers using psychic writing, supposedly taking an average in groups of 6 to choose the numbers from. They never saw the numbers they had supposedly chosen on Wednesday, because he did the averaging calculations, and didn't show them. It didn't matter, he wasn't going to use them anyway. He didn't know the result until they were drawn on Wednesday and his hidden assistant put them on the rack behind the 'freeze frame' left hand side of the split screen.
The biggest clue to how he really did it was in the trailers for that show - a snowflake (as in frozen) .