The Clean Air Act 1993 prohibits emissions of smoke within smoke control areas, unless using an exempted appliance or using an authorised smokeless fuel i.e. fuels that have passed tests to confirm that they are capable of burning in an open fireplace without producing smoke.
We know how fires work.
Thames Valley Fires HETAS Business ID: 6774
HETAS approves biomass and solid fuel heating appliances, fuels and services, including the registration of competent installers and servicing businesses.
Registered installers are trained and approved to UKAS standards and can self certify that their work complies with the relevant building regulations.