I am new to Comodo, I have Internet Security Complete - which I think is an excellent product, but why have both Comodo antivirus and Comodo Internet Security failed on the VB100 tests?

It failed since they say it failed to detect 1 virus out of loads of virus anyways its a detection test CIS as a whole suit along with defence+ CIS can protect against infection

The name is Defense+, not Defence+.