McWhirter was an excellent athlete. He recorded a time of 10.7s for the 100 metres whilst a student and later represented Scotland. He and his brother became sports journalists in 1950. In 1951, they published
Get to Your Marks and that year they founded an agency to provide facts and figures to
Fleet Street, setting out, in Norris McWhirter's words: "to supply facts and figures to newspapers, yearbooks, encyclopedias, and advertisers". At the same time, he became a founding member of the
Association of Track and Field Statisticians. McWhirter came to public attention while working for the BBC as a sports commentator. On 6 May 1954, he kept the time when
Roger Bannister ran the first sub
four-minute mile. After the race, he began his announcement: Ladies and gentlemen, here is the result of event 9, the one-mile: 1st, No. 41, R.G. Bannister, Amateur Athletic Association and formerly of Exeter and Merton Colleges, Oxford, with a time which is a new meeting and track record, and which - subject to ratification - will be a new English Native, British National, All-Comers, European, British Empire, and World Record. The time was three... at which the rest of McWhirter's announcement was drowned out in the enthusiastic uproar. One of the athletes covered was runner
Christopher Chataway, the employee at
Guinness who recommended them to
Sir Hugh Beaver. After an interview in which the Guinness directors enjoyed testing the twins' knowledge of records and unusual facts, the brothers agreed to start work on the book that became
The Guinness Book of Records in 1954. In August 1955, the first slim green volume – 198 pages long – was at the bookstalls, and in four more months it was Britain's No. 1
nonfiction best-seller. In 1954, the McWhirter brothers sued
Daily Mail sports writer
J. L. Manning for his critical piece about non-journalist (i.e. not members of the
National Union of Journalists) sports writers. The McWhirters were awarded £300 in damages. McWhirter was also part of the BBC commentary team for their
Olympic Games coverage between 1960 and 1976. ==Political activity==