Some of the icons have vanished from the top panel.

The ones that are missing are the network icon, the conduit icon, a battery monitor icon that I added and one of the panel separators.

Conduit is still running in system monitor, and the (wireless) network is still working, though I may struggle if I have to set up a new network...

Does anyone have any ideas to get these icons back? I tried the "Add To Panel" option but none of the buttons that I am missing is an option here (apart from the battery monitor).

Thanks.

Try going back to "Add To Panel" and adding a notification area.

That worked a treat!

Thanks Fewt.

Glad to help.