How come there are four judges but it was Simon's decision?
Just before the start of the 6 chair challenge round, each Judge got allocated their category (according to a public vote of which judge should get which category). Simon got the over 25s
Each category has 6 chairs, and the judge who has that category has to decided based on this performance whether the artist gets a chair. Once the 6 chairs are full, then they can only give a chair by swapping someone out. To get each of the 4 categories to allocate their 6 chairs took two programs. All judges were present, but could only give advice when it wasn't their category.
I have to say, I found all this judges angst a bit fake. It seemed to me from the Simon's comments during Anton's performance (and before) it was like he was easily going to select him. But then he just took ages saying so - maybe just to make better TV, who knows.
Incidentally, they had a new twist to Judges Houses round last night. In previous years, the decision of which 3 from the 6 would make it through to the live shows was taken at the house immediately after all the performances and then told to the contestants during the next day. This year, they didn't decide then but we had a segment back in front of the live audience and the judge announced his decision then. He picked two, then listened to advice from the other judges (and the live audience opinion) on the third before picking them.
Anton got through as the second pick in Simon's category.