I saw a lot of bonfire night cakes online, they all looked great, so this is a mish mash of sunhatsandwellieboots and silversponge's cakes. I used a very elaborate cake recipe from; http://www.bbcgoodfood.com/recipes/3092/ultimate-chocolate-cake but a simple or ready made cake would work fine!
I used half a pack of ready to roll icing to decorate the cake, and used the food colouring to colour the icing accordingly. For the flames I used red, yellow and then red and yellow to make orange colourings. I rolled the icing flat and with a sharp knife cut flame shapes out in all three colours.
Place all the icing decorations on the cake, I used chocolate gel icing to stick the flames onto the side.