In June 2009, Sheerman called for a secret ballot of the Parliamentary Labour Party on whether Gordon Brown should continue in office as prime minister.
However, when the Parliamentary Labour Party was reduced in strength after its split at the 1929 general election over Ramsay MacDonald's formation of the National Government, numbers were reduced, and in 1934 membership was opened to all men working in the Palace of Westminster.
His return to frontline politics was marked by his speech to the Labour Party 2006 Spring Conference in Blackpool in which he shed a tear while celebrating 100 years of the Parliamentary Labour Party.
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Hayter has written Fabian Tract no. 451—The Labour Party: Crisis and Prospects (September 1977), Fightback—Labour's traditional right in the 1970s and 1980s (2005), and Men Who Made Labour—Celebrating the Centenary of the Parliamentary Labour Party (2006) (with Lord Haworth).