By 1782, Roch was travelling to England, with a portrait of Mrs Hester Thrale, a friend of Samuel Johnson, dated that year.

He became acquainted with Horace Hone, who also lived on Capel Street, and who painted a portrait of Roch in 1785.

Roch also painted portraits of Charles Le Bas and James King, two masters of ceremonies in Bath.

He also painted a number of portraits of military and naval figures, with the surviving works being of unidentified officers.

[2][4] Interest in Roch's work increased in the 20th century with a number of sales of his miniatures, and a bequest to the National Gallery of Ireland.

Unlike many of his contemporaries, Roch often painted his subjects with a smile or a grin, which some critics such as Daphne Foskett, considered a defect.