Thank you for the replies everyone! I feel though I should have elaborated further in my original post, the rest of the IT department collectively are covering CCTV, Microsoft Word, Excel, Powerpoint and E-Mail meaning I can't really cover any of these subjects.
The Folder tips and tricks is a good idea which i'm sure people will benefit from, i'm also considering demonstrating how to VPN into our network from home (although they all should really know how to do this by now). Please keep the suggestions coming