Health promotion interventions to promote healthy eating in the general population - a review.
Health Education Authority, 1997

An older review which is still a valid and useful part of the evidence base.
It's available on the NICE website under HDA publications at:
http://www.nice.org.uk/page.aspx?o=502219
or you can download it here:
Download review (198 pages)
The full review contains a useful 11 page Executive Summary