Courtesy of Philip Cowley, here are some markers:

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139:       The largest rebellion of modern British politics, over Iraq in 2003.  It was larger than any rebellion of any party since the Corn Laws.

95:         The largest Conservative rebellion of modern British politics. Occurred in 1997, over post-Dunblane gun control under John Major.

91:         The largest rebellion faced by David Cameron, over Lords reform in 2012.

81:         The largest rebellion over European policy by members of any party since 1945 – another Cameron rebellion, this time from 2011.

72:         The largest revolt faced by Margaret Thatcher. Over Sunday trading in 1986.