Examples of guidance to HMRC staff are already in the public domain and can be found at http://www.hmrc.gov.uk/manuals
It would not be appropriate to publish more specific details of the data security arrangements, controls and procedures adopted by HMRC to protect personal and other sensitive data as to do so would be likely to undermine their effectiveness.
HMRC is currently reviewing all training procedures and guidance relating to data security following the recent child benefit data loss incident.