There's a Facebook page in support of the department already.  I'm opening comments for those with more information to post links and/or relevant contacts etc.  (Thanks to Ben Jones for the pointer.)

The Chair, Kath Jones, has posted the following on the FB page:

The situation: The management of the School of Humanities has closed recruitment to the Philosophy programme with immediate effect and are writing to students who have already been given places for Sept 2011 to tell them that these are no longer available. The management are recommending that the Philosophy BA be closed down. This recommendation has to pass through the Academic Planning Committee before it is formally set in stone (but this is only a formality unless we can interrupt it). The Philosophy team were not invited to take part in any of the discussions leading up to this decision, and they have not been presented with any written document detailing the argument for the closure of the programme. The partial statistics that were presented at a school meeting yesterday are out of date and do not in any obvious way support the decision. We have requested proper documentation from the Head of School, but have still not received it. The British Philosophy Association is writing a letter asking the University not to close the programme, which will be signed by Heads of Philosophy departments at other Universities. Past and present students are meeting at the Student Union on Monday at 5pm to discuss how best to protest against the decision. Letters from past students are available (from me) to use for letters to newspapers or anything else.