I am trying to obtain a grant on behalf of my elderly parents for a new boiler under the Warm Front Scheme. Their existing back boiler is old, undersized and inefficient. Their house is small (2 up, 2 down) and they have to have a vent through the wall 10 cm x 10 cm to provide air making the room even colder. The walls are solid brick and the outline of the old chimney flue can be traced on the external brickwork. I do not know whether the boiler has a gas metal flue. Warm Front say that as it works - that's good enough. Apart from putting a pick through the fire, can anyone make a suggestion as to how the fire could be condemned?