Seems /proc is mounted and cpuinfo seems to give the information.
I was interpreting a zero length to mean no content, however guess this is some sort of pseudo access to the kernel/hardware, and the length means nothing.
As for the UNIX flavours, I am a UNIX System Administrator, and have these covered. Just added them for context.
Celebrate the fact that Linux versions do things differently, and rejoice in the fact others are quick to help!
No further help needed, thanks to all...