GC have said nothing about this as far as I know,
The GC has taken up a black band measurement in the official F16 measurement form when no such item is even mentioned in the F16 class rules.
When my boat was measured it came back with a note that my blank band measurement was "an issue". It was no use arguing that the F16 class as a whole doesn't even know what a blank band measurement is.
I now have the questionable honour of having an issue with a F16 rule that doesn't exit.
Wouter