Four recent by-elections in the UK - Airdrie and Schotts, Hartlepool, Amersham and Chesham, and Batley and Spen - tell us four different stories about who we are and what determines who we vote for.

So how well do we know who we are and how has that ‘who’ changed over the last thirty years?

Joining David Aaronovitch in the Briefing Room are:

James Kanagasoorium, CEO of Stack Data Strategy
Paula Surridge, political sociologist from the University of Bristol
Rosie Campbell, Professor of Politics at King's College, London
Rob Ford, Professor of Political Science at the University of Manchester

Producers: John Murphy, Kirsteen Knight and Ben Carter
Editor: Jasper Corbett
Sound Mix: Graham Puddifoot

Image: Liverpool by night Credit: Jenna Goodwin / EyeEm / Getty Show less