I think his birth was registered as Benjamin William Reeve - mmn Kirby - in Norwich in 1883. there's a marriage in 1878 between William reeve and Mary Ann Kirby, and a Jane Reeve also with mmn Kirby b 1878
1891 - Downham Farm, downham
Benjamin Reeve 74, widower, ag lab b herhersett [?]
William Reeve 41 - son, b Wymondham
Mary Ann Reeve 40 - son's wife, charwoman b Gt Melton
Jane Reeve 15 - b Norwich
Benjamin Reeve 8 - b Norwich
RG12/1535/36 p 11