The lamp guttered a little in the chimney draught.

Use draught-proofing products for the doors and windows, fit a chimney draught excluder or use sealed fire guards.

The chimney draught of the 1864 chimney was causing problems, and in 1880 the chimney was abandoned and replaced with a new chimney stack further downhill.

This means that in use the boiler will always operate under a steady pull' or draught - and more economically so than under varying and often excessive chimney draught.

Moreover, if the fire has been out for some time, or a flue damper or thermostat has been closed for several hours, the chimney draught may well be reduced sufficiently to cause smokiness.