Guidance for NHS Trusts and PCOs suggests the following (which is considered as an appropriate guide for practices to follow):
'Major' employment records (e.g. Personal files, letters of appointment, contracts, references & related correspondence)
'Minor' employment records (e.g. attendance books, annual leave records, duty rosters, clock cards, timesheets)
Subscribers to the members section of the FPM website can access a model Record Retention Policy in the practice administration index of the policies and procedures library. If you are not a member, have a look at the information about the benefits of membership and how to subscribe.