Many Northumbrian pipers these days will have a G chanter so they can play in sessions with the usual collection of instruments.

Those were the ones I was thinking of. The others with the F-off chanters generally stick together like a dating agency for people with herpes, so the rest of us don't really need to know about them.

In any case, the F-off types will still be producing a G with that fingering; the note corresponding to a blob on the second line. It just happens to be a G from the French Baroque. Highland pipers have the same issue, with their A for the same fingering sounding somewhere between B flat and B. But the note is written as an A and that's what they call it.