take a look at %APPDATA%\McAfee\McAfee Firewall Enterprise v8\ac\Lib\cobra.ini
Many thanks for the suggestion.
I've found my %APPDATA%\McAfee folder, but the only sub-folder present is "Common Framework" (I have the McAfee Agent installed on my machine).
I'm not sure why my original attempt didn't appear to yield much, but I have just searched my C: drive for instances of cobra.ini and have actually appear to have found its location. For a moment I wondered why it came back with two results and then I remembered I have both the v7 & v8 Admin Conole applications installed.
Anyway, in case it is of use to any other's. The location of my cobra.ini file is:-
\users\<my_username>\AppData\Local\VirtualStore\Program Files (x86)\McAfee\McAfee Firewall Enterprise v8\ac\Lib