Do I need to book in advance? Toni 17 May 2022 16:37 Updated Follow No. You can buy tickets when you get here. But we get very busy, so it’s best to book ahead. Related articles I’ve got a fear of heights. Can I still climb? Can I get a refund if I’m scared or worried I’ll not complete it? How do I know if I can complete the course? Can I do Up at The O2 if I'm pregnant? Where can I park if I’m going Up at The O2? Comments 0 comments Article is closed for comments.