Mastermind 2011/12 Episode 26 Episode 26 ( Air Date 2012-03-30 ) Genre Talk category. Overview "In the second semi-final of the series, John Humphrys invites five contenders to answer questions for a place in the Grand Final. Subjects include the life and career of Herbert Chapman; the life and times of Benjamin Disraeli; railways of Great Britain in the 20th century; the life and career of Edward Jenner; and the Blandings stories of PG Wodehouse.".