
This is a picture of the wedding cake.
All cakes for special occasions in England like weddings, Christmas, Easter , Christenings and so on, are made of a mixture of flour, butter, eggs, sugar and a large amount of sultanas, raisins, currants, maybe peel and nuts and laced with a generous quantity of whisky or brandy.
They are cooked some time( like months) before the date of the event and so become very rich. Therefore you only usually eat an very small piece. Traditionally, the top tier of the wedding cake is kept as a cake for the Christening of the first child, because it can be kept for two or three years. They didn't want to keep it partly because it was coloured and because they sent pieces of cake to people who didn't come to the wedding, which again, is tradition.