Not sure what you mean about beer duty the kit is ã31 plus ã2-3 for yeast, brews 40 pints so less than a ã1 a pint and to be honest better than some bottles in the supermarket.
Just wanted to put up a post about the amazing fresh WORT kits I found at my local brew supplier. These kits are so much better than the can kits you get, they are straight from a small breweries batch brew and come in 23l tubs ready to be put in your fermenting bin. You choose what ever yeast...