In the 1970s, he also acted in radio comedies, including the weekly topical satire "Week Ending" (in which he regularly played such figures as then UK Foreign Secretary Dr David Owen) and "The Hitchhiker's Guide to the Galaxy" (as the "B Ark Captain" in the sixth episode, in an in-joking reference to his "Week Ending" role as Owen). Jason also appeared in "The Next Programme Follows Almost Immediately" and made appearances on panel games such as "The Impressionists" as well as his own series, "The Jason Explanation". In the early 1970s, he appeared in "Mostly Monkhouse".