Partnership with Thomas Phelps appears to be dissolved by 1799.
Directories record James Davenport as a Spectaclemaker at 1, Oat Lane, Queen Street, Cheapside, for the period 1800-1805. 1, George Street, Foster Lane, in 1816 and 30, Wellington Street, Goswell Street, in 1836.
His business was perhaps succeeded by Charles Davenport. See: viewtopic.php?f=74&t=28757