Ian, please be careful when using wire wool, it burns by itself when subjected to an open flame, some of the very fine stuff can be very difficult to extinguish. In fact it doesn't burn, it oxidises at a very fast rate (rusting to us laymen).
Here in the UK you can go to the big DIY stores and buy fibre glass wick designed for outdoor spirit lamp burners. It seems to go on forever without burning away.
John