[1][2] Born in Sleaford, Lincolnshire, Knapp was educated at Lancing College and Oxford University.
He retired in 1891 and spent the rest of his life as a "private gentleman" in Wellington, sharing a residence with Martin Chapman KC.
[3] In his next match a year later he was again the highest scorer, with 31 and 10, when Wellington lost narrowly to Nelson by two wickets.
[6] Knapp was a life member of the Wellington Football Club and a referee, and a participant and administrator in both rowing and athletics.
In his later years he was a keen bowler; he died at home the day after collapsing on the green at the Wellington Bowling Club, aged 81.