Actually, after playing around with Osmo for a while and trying to
figure things out (it is very poorly documented and setting up
recurrences took ages trawling through mail lists) and checking out
Chandler (a cross-platform PIM app) I have opted to go with Korganizer.
It is a little bloated, being part of the KDE family, but has a system
notification icon, shows the views that I want, is pretty intuitive to
use and has an easy to figure out recurrence setting.
So, FWIW, this seems to have been what I was after all along ... go
figure! Anyway, as always, many thanks for the suggestions and good luck
in sorting out your own needs Gilbert.
Cheers
AG