1921 Census findings, Ventilating Classrooms, Recycling Christmas Trees and WW

Alex Lewczuk in conversation with historians Mary Mckee and David Olusoga followed by Professor Paul Linden, expert on the role of ventilation in the airborne transmission of Covid-19; and Chris Brown, head of public sector at phs andTV Gardener Rachel De Thame & Dr Helen Lawal & Dr Emeka Okorocha.