I was in the area yesterday and I remembered that it was near there so decided to go see if I could find it. It's literally 2 minutes from Golders Green tube station so it wasn't difficult.
Waited there for about 30 minutes around 4ish to see if they would get back from rehearsals but unfortunately they didn't. It was nothing like these pictures though, the security guards were keeping everyone on the opposite side of the street behind a barrier.
There were loads of kids wearing J&E t-shirts and this guy from Heat mag was taking pics of them. Then some camera filmed everyone screaming along the barrier. There was also some BBC News woman, and I just outside the gates to the house some guy did a piece into a camera saying 'We're here outside the X Factor house, where the fans are going mad, but the neighbours are not'.
It was great though, even if I didn't see anyone, and if I get the chance I will go again.