The Information Commissioning Office (ICO) is a UK independent authority, set up to uphold information rights in the public interest. Their site has a range of useful information about the General Data Protection Regulation and also a link to a data protection self assessment toolkit.
The Guide to the GDPR explains the provisions of the GDPR to help organisations comply with its requirements. It is for those who have day to day responsibility for data protection
LINK TO EXTERNAL SITE