I apologise for my ignorance but I am now thoroughly confused.

All the discussion about cable resistances etc. mean absolutely
nothing to me but I am pleased that it has stimulated a debate about
relative values.

Taking this thread to its ultimate: Do you suggest that running both
cables side by side or even taped together as one poster suggested, is
the way to go, or should I still consider seperate conduit?

I really appreciate the response,

Regards, Peter.