While BRE made Part L 2013 SBEM data available in December 2013, this was largely for testing purposes and for software developers of SBEM interfaces such as Hevacomp. As the actual switchover date to the 2013 regulations is not until April 2014 we do not have an estimated delivery date for the relevant updates to Hevacomp as of yet. At the moment we do not know how the changes to SBEM will affect the formatting of the relevant SBEM input files and the Hevacomp code will need to be updated to incorporate these changes.
Please refer to the following website for further information: http://www.2013ncm.bre.co.uk/
At this point if you are looking to assess the impact of the new regulations then you will need to use BRE's iSBEM tool. You can download this at: http://www.2013ncm.bre.co.uk/download.jsp