The Cambridge Centre for Housing & Planning Research (CCHPR) has published various resources and reports about digital exclusion:

Digital exclusion and the importance of getting online
Link: https://www.cchpr.landecon.cam.ac.uk/Research/Start-Year/2017/building_better_opportunities_new_horizons/digital-exclusion-and-importance

The Digital Divide: what does the research tell us?
Link: https://www.cchpr.landecon.cam.ac.uk/Research/Start-Year/2017/building_better_opportunities_new_horizons/digital_divide_research

Coronavirus has highlighted the UK's digital divide
Link: https://www.cchpr.landecon.cam.ac.uk/Research/Start-Year/2017/building_better_opportunities_new_horizons/digital_divide

Tackling social and digital exclusion
Link: https://www.cchpr.landecon.cam.ac.uk/Research/Start-Year/2017/building_better_opportunities_new_horizons/tackling_social_digital_exclusion

Digital exclusion and poverty in the UK: How structural inequality shapes experiences of getting online
Link: https://www.cchpr.landecon.cam.ac.uk/Research/Start-Year/2017/building_better_opportunities_new_horizons/digital-exclusion-and-poverty-uk