Paragraph 6F F1
(1)
The installation, alteration or replacement of a flue, forming part of a combined heat and power system, on a dwellinghouse or building containing a flat.
(2)
Development is not permitted by this class if–
(a)
the height of the flue would protrude more than 1 metre above the highest part of the roof (excluding any chimney) on which the flue is fixed;
(b)
in the case of land within a conservation area or World Heritage Site, the flue would be installed on the principal elevation of the dwellinghouse, or building containing a flat; or
(c)
in the case of a combined heat and power system fuelled by biomass sources, the flue would be within an Air Quality Management Area.