Yeah there's free wi-fi across campus, you'll be given directions on how to set it up when you arrive in fresher's week
It's really fast in the mornings and early afternoon, then slows down a bit in the evening (though you can still play 720p youtube videos, play games online, etc without any problem).
The only time it's noticeably slow is during the revision weeks, because then you've got a lot of 2nd, 3rd, 4th years spending all day on campus in the library, slowing the internet down.
Saturday mornings, the internet is atomically fast, downloaded a 20GB computer game in 45 mins
edit: btw guys, if any of you have general uni / accommodation questions then feel free to quote-ask me, and I'll do my best to answer them