Can I study archaeology at uni with no prior knowledge or experience?Watch
Absolutely not! You do not need prior knowledge or experience to study Archaeology, but it just helps.
Not many people know a great deal about Archaeology because it's a subject they've never encountered before. Pending the universities your applying to however, I would recommend reading a simple textbook on the subject - just to make sure it's right for you. Archaeology: an introduction by Kevin Greene is a really nice, easy to read introduction. I highly recommend it!
You might want to consider getting some experience at a dig, volunteering at a museum, etc, but often these are quite hard to get, so I wouldn't worry about it too much. As aforementioned, the York digs are very good, so you might consider applying to some of those! At the end of the day it depends how competitive the university is: you might get side-lined by those who have experience or have read around the subject widely. But ultimately, go for it!
It might however be a good idea to acclimatise yourself with archaeological theory/methods if you aren't already familiar with them. Try and get hold of a cheap 2nd hand copy of Archaeology: Theories, Methods and Practices by Renfrew & Bahn, it teaches you the basics and includes case studies.