Here are some handy resources to learn more about smart meters:

Citizen Advice: https://www.citizensadvice.org.uk/consumer/energy/energy-supply/your-energy-meter/getting-a-smart-meter-installed/

Smart Energy GB: https://www.smartenergygb.org/

Ofgem Smart Meters: https://www.ofgem.gov.uk/information-consumers/energy-advice-households/getting-smart-meter

Energy UK: https://www.energy-uk.org.uk/

CoMCoP (Consolidated Metering Code of Practice) : https://recportal.co.uk/smicop