Found they hadn't lined the chimney (woodburner), big pile of soot on top of the register plate was smouldering away rather too well .....hotter....and hotter....and hotter...... worried about the beams etc. catching. Ripped the flue out of the register plate and sorted it out. Few bucketfulls of soot were well alight :w00t:. Thank god I wasn't pissed at the time!
Next job - chimney liner.