We went last year, we went on a Monday morning, around the 12/13th Dec and got there just as it opened. It was empty! There were about 10 people watching the circus - which was ok but not great. I think I'd save my money and go to a different circus if we went to wonderland again. Our LO was just over 2 at the time and he loved the place itself, there were plenty of rides he could go on (watch out though the cost soon adds up). We walked up to see santa, no queue at all, but one of the elves told us people had been queuing for 4 hours the weekend before. Really obvious comment, but if you go in the ice kingdom make sure you have plenty of warm clothes, its really really cold in there! Our friend went closer to Christmas at the weekend and said it was horrible, you could barely move. By the time we left at about 3ish, it was starting to get really really busy you could just see people pouring in. So, I think its all about timing - if you get it right, its fine but if not its a nightmare. We won't be going again this year. I've been told theres one in a park in the Stratford area which is smaller and better if that helps. Can't remember its name though sorry, although I could find out for you if you'd like.