Don't laugh -
Bearing in mind that I only got the machine yesterday, is it possible that it just needs a good battery charge?
With this in mind I've left it at home on charge while I go to work, will try it again tonight.
Secondary Ref Charging: when I plugged the charger in Rockbox loaded but the little battery icon was not animated (?).
Is it actually charging, or do I need to boot the original Apple software BEFORE charging?