Just had a look there, and the Leeds Safeguarding Board (my trust) has written in its annual report 2011-2012 the following:
Category 10 (Sudden unexpected, unexplained death) accounts for 10 deaths. 9 of these were babies who were found dead during their sleep. Of these, 5 involved cosleeping with one or more people in the bed or on a sofa. For all 9 babies, either mother or father or both were current smokers at the time of death. In 4 cases, soft bedding or over-wrapping were noted to be factors, although information was not available for all cases. As noted previously, alcohol use by a parent was noted to be present in 4 cases, and drug use by a parent in 3 cases.
Based on these deaths, recommendations were made to update cosleeping advice. The Panel had already made recommendations in 2009 that smoking should be targeted in all pregnancies and a further recommendation was made that the Director of Public Health at NHS Leeds and Leeds City Council should initiate social marketing work to ensure that co-sleeping messages are disseminated widely and appropriately to target populations.(March 2012):
A piece of insight work into co-sleeping practices in targeted parts of the city has been undertaken by Social Marketing Gateway, involving young parents and professionals. This has led to the development of tailored resources built around the message: ?Let me sleep safe; Let me sleep on my own.? Resources are now being disseminated in targeted areas.
So to me, it would appear that the messages arose out of safeguarding concerns and it was decided from working with communities at risk that a simple message was best.
On the other hand, here is an advice leaflet from Stockport on how to bedshare/cosleep that matches evidence while also saying that cosleeping is not recommended.
Portsmouth have a document which I can't link to for some reason which says that 70% of babies who die are in the same bed as their parents (don't think this is very accurate) and advising health staff to question parents on their sleeping arrangements, indicate this risk to them and record it in the notes.
So very different approaches taken based on local need, I guess. As is usual in the NHS.