Sunday schools and madrasas should be treated as "informal classrooms" and monitored accordingly, the head of education at Birmingham City Council (BCC) has said.
Colin Diamond, the council's corporate director for children and young people, has called on the government to regulate education spaces outside of formal school settings.
He told Tes: "Thousands of kids in this city will go to education spaces this evening and will be there for a few hours and will be taught about Koranic values or Christian values. We feel they should be regulated.
"These are classrooms by any other name. They are large groups of children. I do wish the government would grasp this stingy old nettle."