From: HSE
Health and Safety Executive (HSE) has published a revised version of EH40 to replace the previous version which was first published in 2005. This edition takes into account new substances and workplace exposure limits (WELs) that have been introduced in 2007 and 2011.
Follow the link below for a free copy of this regulation.
http://www.hse.gov.uk/pubns/priced/eh40.pdf
These new exposure limits take immediate effect over the previous edition.