A true show stopper: Tesco Ice-cream Sundae Gravity Cake

Now this is a real party piece. It's what appears to be a gravity-defying, 3D celebration cake, shaped to look like a nice cream sundae being drizzled from above by chocolate sauce. The jug and sauce are, in fact, solid chocolate and come separately in the box. Upon assembly, the solid chocolate jug and sauce are pushed into the top of the cake (sorry if I've spoilt your illusion!) The actual cake itself is a plain sponge with a filling of butter cream and raspberry jam, although when a cake looks this impressive, I don't think people are really that bothered with the flavour! 
£15.00 from Tesco, serves 20 people