“…The British literature is rich in cross-party comparisons (Bale and Webb, 2014;Denham, 2013Denham, , 2018Denham et al, 2020;McAnulla, 2010;Quinn, 2005Quinn, , 2012Stark, 1996); single-party case studies (Alderman, 1999;Alderman and Smith, 1990;Bogdanor, 1994;Denham and O'Hara, 2008;Heppell, 2008Heppell, , 2010McSweeney, 1999;Niendorf, 2021;Quinn, 2004aQuinn, , 2018a; and single-contest studies (Alderman and Carter, 1991, 1993, 2002Denham and Dorey, 2007;Denham, 2011, 2016;Drucker, 1976Drucker, , 1981Drucker, , 1984Heppell, 2021;Jobson and Wickham-Jones, 2011;Pemberton and Wickham-Jones, 2013;Quinn, 2016. A quantitative literature collates MPs' preferences in individual contests to uncover factional patterns (Booth et al, 2023;Cowley and Bailey, 2000;Cowley and Garry, 1998;Crines et al, 2018;Jeffery et al, 2018Jeffery et al, , 2022Jeffery et al, , 2023Heppell et al, , 2022Heppell and Crines, 2011;Heppell and Hill, 2008, 2009Roe...…”