The Fresh Expressions email sent a link to this video.  The issue it highlights was the focus of the keynote address by Graham Cray at Sheffield Diocese day of workshops looking at Fresh Expressions.  His most poignant remark was along these lines (I type from memory):

My advice for people who want to set up a fresh expression is ‘don’t’.  Spend a year or two praying with a group of people about where God is working in your place.  Don’t just try to transplant something from somewhere else.  See what grows out of the area in which you are.