The CDM regulations 2007 update the previous 1994 regulations and incorporate the Construction (Health, Safety and Welfare) Regulations 1996.
One of the principal changes is the strengthening of the duties imposed on clients. Clients have new duties in relation to the management of projects (r9) and in relation to information (r10).
For example, clients need to take reasonable steps to ensure that there are suitable arrangements made for safely managing the project (including the allocation of sufficient time and resources) by all involved.
HSE have published an Approved Code of Practice 'Managing Health and Safety in Construction' to accompany the regulations. There is further background on the HSE website.
The EEF H,S&E Guide now includes the main changes, together with an updated H&S Summary Sheet.