On 2nd thought... maybe I was being abit harsh..
In the labs you are in smaller gps and at least find out someone's name, but we don't seem to do anything as a gp. I found that it's the people that I live with who I've really come to know well and love hanging out with rather than the people in my sci course.
Some of my pals from high school are at at Oxbridge and the sci students there are really close. e.g. the chem students organize weekly pub cralls, amazing chem parties, raves, balls, fancy dress, sports competitons against the physicists with lots of really weird themes and they all know now each other really well. I just don't see that happening here. Since there's only about 80 in their class they all have each other's contact info since it's is a the class list, plus they all use TSR alot, so they've got ways to quickly and easily organize stuff as a gp.