Letter to current employee under notice.
Dear [ ]
RE: CONFIDENTIALITY ISSUES
[Whilst you have been away [on annual leave],] it has come to my attention that you have recently requested and received details about [add detail] or [add details about].
There appears to be no business reason why you should require this information and I am concerned as to why you have requested it. Given that you will shortly be leaving the Company’s employment [to work for one of our competitors], I am taking this opportunity to remind you of your ongoing obligations to the Company both before and after your employment has terminated.