thank you for your suggestion; however the 'air gap' is just that.
There is no connection to the Internet at all (nasty, insecure, dangerous thing that Internet).
My strategy has to be to move data on physical media (such as CD) across the airgap.
Working on the other helpful posts at present to establish a disc-based repository for local use of 'ppm'.
Re^2: Installing CPAN modules without using 'ppm'