Bruce Purchase
His TV credits included "Callan" , "The First Churchills" , "Clayhanger" , "A Picture of Katherine Mansfield" , "Doomwatch" , "Fall of Eagles" , "I , Claudius" , "The New Avengers" , "Doctor Who" ( in the serial "The Pirate Planet" ) , "Blake's 7" , "Quatermass" and "The Tripods" . 
<triplet> The Pirate Planet <subj> Doctor Who <obj> part of the series