'Big Society' Volunteering & Job Substitution

As austerity cuts kick in, an article in this week's Economist magazine highlights a rise in the number of volunteers running public services, notably in libraries where 'the number of volunteer librarians has increased by over 70% in five years, to 21,642 in 2011'.
http://www.economist.com/node/
21559939?fsrc=scn/tw_ec/unpaid_armies