Chislehurst is a suburban district of south-east London, England, in the London Borough of Bromley. It lies east of Bromley, south-west of Sidcup and north-west of Orpington, 10 miles south-east of Charing Cross. From Wikipedia
The boy fell unwell at Coopers School in Chislehurst and was pronounced dead shortly after being rushed to the hospital, with authorities treating the death as unexpected but not suspicious.