Sissons cited a 2009 interview he conducted with Harriet Harman as the final catalyst for his decision to leave the BBC. He noted how producers seemed "twitchy" about leaving him to interview the Labour politician unsupervised, and that those producers contacting him with advice "seemed to be fully paid-up members of her fan club." Sissons noted his shock at being urged not to raise the issue of a breaking controversy surrounding Gordon Brown failing to invite the Queen to a D-Day commemoration event, because it was "only a campaign being run by the Daily Mail". He asked the question anyhow, and upon arriving home afterwards decided he no longer wished to work for the organisation.