For this particular cake, both the flowers and the cake can be mad quite far in advanc, which removes a lot of stress from the weddng week itself. Like all traditional fruit cakes the cake is made in advanced and soaked in small amounts of liquor ( I used brandy) over a few weeks or months. This will be familiar to anyone who has made a christmas cake.
Sadly, your cake isn't going to be preserved in a wedding cake museum for all time — or maybe not so sadly since that would be such a big waste of butter — so be sure to take lots and lots of photos. Most wedding photographers will take lots of shots of the cake, too, and you can ask the bride or groom for those later. And make sure to get one of yourself with the cake!
Once cooked, leave the cake to cool in the tin. When cool, remove from the tin and place on some baking parchment. Drizzle a couple of tablespoons of brandy (or your other chosen liquor) over the cake and wrap it up tightly in parchment and clingfilm or foil. Every few days unwrap the cake to feed it with another spoonful of liquor, then wrap it back up and return to a safe, temperate storage space.