Thanks TerryF for the reply.
There is no "authorisation signature" data as such in the "Account" tabbed section nor anywhere else that I can see - I registered and obtained a "Basic" account type for free.
So I'm unable to proceed to use the ClamAV Unofficial Sigs at this point without being able to progress...
Anyway will await to see if I can find anymore info about this signature.
TIA
Bill Y