Half (55%) of NHS mental health trusts now have foundation status, according to Monitor, the regulator of NHS foundation trusts.
Foundation trusts have more managerial and financial freedom than other NHS trusts. The government hopes foundation trusts will devolve decision-making from a centralised NHS to local communities.
But critics fear foundation trusts will create a two-tier healthcare system.
The first wave of mental health NHS foundation trusts was authorised in May 2006.