Hi again Kimzi
I could indeed access the E:\Temp folder on my PC from my wife's PC (the Win 8 one)by typing in \\MBS6\Temp on her PC.
I changed the setting in Advanced Sharing Settings to "Use user accounts and passwords to connect to other computers" (after which it wanted my to logoff and back on again) but this made no difference.
I already had "Turn off password protected sharing" ticked.
I cannot say the same thing happened with the Win8 PC, rather that I failed to ever get it working in the first place, although I may have made a half-hearted attempt at setting it up because I was either annoyed by that stage or the settings were just getting too confusing introducing another PC and IP address into the equation !