Thanks for the advice, the water thing was of course very sensible. So far I've made one of the zeros as a fruit cake (Mary Berry) and have made fondant butterflies and flowers and a little Grandma. My M-i-L will be 100 so it needs to be pretty.
thanks petra , that is of course the very sensible thing to do to make quite a lot fill the thing to three-quarters and then fill cupcake moulds with leftovers. Just trying to work out just how much I dare to go to, maybe a version of the 666 recipe and go 888.
I have bought a Whisk brand number '1' silicone cake mould. It is 11" long and its little serif hat thngy is anoth 5" . It is 2 " deep. How much batter should I make? OR and ALSO how many packs of Betty Crocker ? I'm making it for 100th bithday hence mould for speed as there's lots of fancy icing to go on top.