Just seen tesco are now selling a nice FM foam extinguisher for £9.99. It looks like brushed aluminium. I think that's the foam that is safe on thiongs like chip pan fires and can be used like an aerosol over and over again for small fires. It says not for electricity but they mean mains.
Think it's similar to this
http://www.compass24.com/cgi-bin/abn...rnliste=971340
Not sure as it was 2.30am when I was in there!!! Will buy some later. Probably only in the biggest stores.
