UK Elections Statistics
http://www.parliament.uk/commons/lib/research/rp2004/rp04-061.pdf
parliament.uk - From the House of Commons Library: UK Election Statistics 1918-2004
http://www.parliament.uk/commons/lib/research/rp2004/rp04-061.pdf
parliament.uk - From the House of Commons Library: UK Election Statistics 1918-2004