Humphreys has recorded Audio Commentaries for several of his The Bill episodes, including "Traffic" (alongside writer Christopher Russell and co-star Andrew Mackintosh) and "Citadel" (alongside writer J.C. Wilsher).
Humphreys has produced Audio Commentaries for multiple The Bill episodes, including "Traffic" (with Christopher Russell and Andrew Mackintosh) and "Citadel" (with J.C. Wilsher).