From the 2006-07 reference costs the national average cost, per bed day, for medium secure mental health units is £453. This is for national health service trusts and primary care trusts combined and is sourced from Schedule 4 of the 2006-07 reference costs.
For the number of people who received treatment in Tier 5 NHS medium secure services, I refer the hon. Member to the written answer I gave the hon. Member for Somerton and Frome (Mr. Heath) on 20 March 2008, Official Report, 1315-16w.
The information requested on community forensic services is not available centrally.
Tier 4 services are mainly specialist in-patient services for those people with severe and complex personality disorder but who do not present a risk to other people and who are not detained. For the year 2005-6 these services were treating approximately 100 to 120 people per year on an in-patient basis; and 70 patients per year on a day basis. The cost is approximately £1,500 to £2,000 per week for in-patient services.