We have lived in our house (built: 1870) nearly 15 years, over which period a running battle has been fought with draughts. Most of the rooms have open fireplaces: apart from the couple in which a fire is ever lit, I had long ago stuffed the chimneys with fibreglass.
Last week, though, there was much reference in the paper to chimney balloons, which were new to me. Would these be a better solution for our unused fireplaces, I wondered. Well, in the process of inspecting our chimney openings, I discovered that no less than three of them had neat little trap doors, hinged so that they could be pulled down when the fire was not lit. And I'd never even realised. Amazing!