 The programme was the first in the UK to combine interviews with celebrities and heavyweight political figures on the same show, blurring the line between classic British comedy and analysis of international affairs.In parallel with David Frost's approach to television Callan has since developed a technique known as "news colour" in which a hard news story is reported in a feature style.It has the effect of placing the reader as if he is actually witnessing the story, and is now taught in journalism school.