He is generally ranked among the least successful British Prime Ministers of the 20th century , although two broadly sympathetic biographies ( in 1986 and 2003 ) have gone some way to redressing the balance of opinion .
But he is often ranked among the least successful British Prime Ministers of the 20th century , although two broadly sympathetic biographies ( in 1986 and 2003 ) have gone some way to redressing the balance of opinion .