Alistair Petrie

 voiced several characters in various Big Finish Doctor Who audio stories and spin-offs.

Doctor Who Main Range

 * Criss-Cross - Major Harris / German lieutenant

Fourth Doctor Adventures

 * Dethras - John

The Early Adventures

 * The Outliers - Richard Tipple

The Churchill Years

 * Living History - Julius Caesar

Rose Tyler: The Dimension Cannon

 * Ghost Machines - Wallace Richards