If you live in a smoke control area it is an offence to produce smoke from a chimney of a building, or a chimney of any fixed boiler, unless you’re burning an authorised fuel or using exempt appliances (e.g. burners or stoves). In practice this means that in a smoke control area it is illegal to burn house coal or wood in an open fire, although it is legal to burn these in a stove or other appliance that has been approved to burn that fuel. That’s why it is important to use both a right stove and a right fuel.