As hardcoreobscure says, you should get pretty good speed (I was often limited by hard drive write speed when downloading, put it that way), but pretty heavy firewalls.
Soton unrestricted torrents last year, which briefly brought the network to a standstill when people found out, but it soon calmed down. I had a fair bit of trouble with the Counterstrike server lists, but then Steam is broken 95% of the time anyway. LFS was fine IIRC. Pings were usually excellent too, often sat at 5-15ms in CS.
Depending on just how geeky you are :P network staff may open things up to you if asked nicely, depends what you want really.
I hope you enjoy your day at UEA, I personally didn't visit there, but it was too far away from home for me really.