All clients are charged but not until they exhaust an allocated free quota. The free quota was set in the first year of operation using historical data massaged to take into account the effect of filtering. This year the quota is based on actual use in 2000. See previous question. Yes for staff, alumni and others.
Students get a free level of internet access and can purchase upgrades at discounted rates.
Yes Charge staff only. A site supplying viruses and another allowing anonymous sending of official looking email. Budget centres are responsible for the costs incurred by their staff and students. None are in place for staff however we are able to implement this if required. Quotas have been introduced for students this year.