Frost signed for Rediffusion, the ITV weekday contractor in London, to produce a "heavier" interview-based show called "The Frost Programme". Guests included Oswald Mosley and Rhodesian premier Ian Smith. His memorable dressing-down of insurance fraudster Emil Savundra, regarded as the first example of "trial by television" in the UK, led to concern from ITV executives that it might affect Savundra's right to a fair trial. Frost's introductory words for his television programmes during this period, "Hello, good evening and welcome", became his catchphrase and were often mimicked.