Unfortunately not. Whilst certificates are dated for a three year period, ISO/IEC 27001:2005 will be obsolete from 1 October 2015 and therefore all certificates to the 2005 version of ISO/IEC 27001 expire on this date. If you do not complete your transition to ISO/IEC 27001:2013 before this date your certificate will be cancelled. If you are a BSI client, speak to your client manager to agree timescales for this transition to keep your certification active.