This thread may flop, it may not. But this forum seems like the best place to ask
I have been collecting the: Nuffield studies(The British General Election of..) Britain Votes Political Communications(started from 1979) Britain at the Polls(from 1974 though none for 1987 and 2015) Explaining Labour's Landslide and it's sequels
I offer the following suggestions for General Elections before 1945:
T. Lloyd, The General Election of 1880, Oxford University Press, 1968. A.K. Russell, Liberal Landslide: The General Election of 1906, David and Charles, 1973. N. Blewitt, The Peers, The Parties and the People: The General Elections of 1910, University of Toronto Press, 1972. A. Thorpe, The British General Election of 1931, Clarendon Press, 1991. T. Stannage, Baldwin Thwarts the Opposition: The British General Election of 1935, Croom Helm, 1980.
T.G. Otte and P. Readman (eds.), By-Elections in British Politics, 1832-1914, Boydell Press, 2013. C. Cook and J. Ramsden, By-Elections in British Politics, Macmillan, 1973.
But my number one pick for a good read is:
C. Cook, The Age of Alignment: Electoral Politics in Britain 1922-1929, Macmillan, 1975.