We went week 2 on the Saturday. Queued from just before 1:30 and only about 120 people in front of us got in, and about 12 people behind us. There could have been around 300/400 people behind us too, and our seats were restricted view because of the numbers left. It depends on how many guests/VIPs there are (Talk Talk had loads of people there when I went,ITV2 did as well, plus journalists/celebrity guests and whatnot) So I would suggest before 1pm to guarantee. Saying that, apparently they got 500 people in week one, so its hit or miss. Get there EARLY. There is a McDonalds nearby, so you won't starve! And wrap up warm.