Tash and I have been trying to come up with a list of printers in town that you might want to frequent!
http://www.printing.com/contact/samples are ok but expensive sometimes
http://www.reflexmedia.co.uk/ are apparently cheap
http://www.marctheprinters.org/ I love Marc the deal with a lot of recycled paper stocks and inks are really cheap and let you do small runs too
http://www.pdc-manchester.co.uk/ I've only used them once but they were quite cheap and very friendly.
http://www.entwistlegroup.co.uk/ i know a few students have printed books and magazines out from here.
Feel free to post up some links of ones that are good or bad . . .