Radio 4, the evidence for cough mixtures and placebo effects.

http://www.bbc.co.uk/programmes/b019rqcq#synopsis

UKspends 532 million annually on winter cold remedies

http://oxygen.mintel.com/sinatra/oxygen/display/id=479764

Cochrane review of OTC cough medicines

http://www.ncbi.nlm.nih.gov/pubmed/18253996

Deaths in children using OTC cough  remedies

http://www.ncbi.nlm.nih.gov/pubmed/17218934

MHRA safety advice 2010

http://www.mhra.gov.uk/Safetyinformation/Safetywarningsalertsandrecalls/Safetywarningsandmessagesformedicines/CON038908

MHRA advice to use honey in children with cough

http://www.mhra.gov.uk/home/groups/comms-po/documents/websiteresources/con038905.pdf

Journal of the Royal Society Medicine – honey

http://jrsm.rsmjournals.com/content/103/5/164.citation