Book of historical failures

An amusing old conspiracy theory has recently come my way. In 1981 many right-wing Labour party members quit to form a new party, the SDP. The year before, the Labour party had elected the very left-wing and pro-disarmament Michael Foot as its leader. Some of those who formed the SDP voted for Foot despite their political differences. Why? Nevil Sandelson, an MP for Labour and later the SDP, claimed that he was one of six right-wing Labour members who conspired to elect Foot and thus destroy the Labour party. Sandelson went even further: as an SDP MP in 1987 he called on voters to vote for the Tories rather than his own party, in order to destroy Labour more thoroughly. Could any MPs today have similar plans? (The Telegraph's obituary of Sandelson)