First time I've done this crossword. Certainly makes you work. Just need confirmation on 2 and then finished. 10d O?T?I?R. Is it OUTLIER (Point on a scatter diagram widely separated from the main cluster) 19a ST?R O. Is it STERAO (A flammable hydrocarbon jelly used as cooking fuel)
Thank you both very much. Have just checked out STERNO on wikipedia and that would appear to be the answer. Gives a little picture of the product in a can so presume its a trade name. Not that I doubted you for one second Kayakamina!!!