Hello again,
Having had a search around the Forum and Apache wiki sites, it appears the things I need to do are:
Change the "site url" in the "Site settings" tab of Site Administration to replace http with https ;
as well as
Make changes to the Apache2 configuration files to use either the "Redirect" or "Rewrite" directives to push requests from http to https.
Is that correct, and which of the "Redirect" or "Rewrite" methods is recommended (presumably the directive would be included in the main configuration files, rather than in an .htaccess file)?
Also, I think I should've put this topic into the "Installation" forum originally. Is there any way for me to move it?