Social Enterprise UK is the national body for social enterprise and has a wealth of information, news, advice and resources on it’s website here http://www.socialenterprise.org.uk/.
The Social Enterprise Guide for people working in local government is full of really useful information and explains how social enterprises can help to meet many local authority strategic objectives, it also gives lots of practical advice about how teams within local authorities can engage with social enterprises to benefit their communities.
The guide contains some really useful information on the different legal models that social enterprises can take, ideas and information about commissioning and procurement and how to support the creation of social enterprises spinning out of the public sector.
The guide can be downloaded here: http://www.socialenterprise.org.uk/uploads/files/2012/02/local_authority_guide_final1.pdf
The resource library is here: http://www.socialenterprise.org.uk/advice-support/resources