Frederick was born in Lydney, Gloucs.
I have this from my grandfather years ago (who was George's son, Frederick's grandson).
Since you mention those cousins who were also on the 1901 census entry, they are incidental to my story. But when I traced them back, it seems that Gertrude was actually born in Oxfordshire from what I see.
They seem to have had a habit of telling porkies on census night in 1901
