Still early days for my site, but here goes again...
From my main page I can link to this archive. These monthly archives in turn link to a calender archive.
Problem is I can't link via the individual calender entries to the individual archived image/entry pages like I can do when I set archiving to 'individual' through preferences. How can I link via the calender images to the individual image/entry pages while retaining the initial monthly list? Gosh ...does this make sense? I hope so

I'm not sure I follow, but: Do you have Individual Archiving enabled? You should just be able to use in your calendar template.

I'm not sure how that relates to your initial monthly list, though? Me confused!

Just to add...
It also seems I now can't link directly to the previous entry via 'previous' on the main page. It goes directly to the calender. How do I correct that?

Did you change the Preferred Archive Type to Monthly? You might find it easier, if you want to link to the Individual pages more often, to change it back to Individual, and then use the following to link to your Monthly pages.

Thanks for the speedy replies, maddy.

I've now enabled Individual Archiving again to try your approach.
Question: whereabouts do I put in the Full Calender template? Can it go anywhere?

...or maybe I don't put it in the Full Calender template at all?