Instead of "feeding" your fruit cake over weeks and weeks you put the brandy over the cake while it is still warm from the oven. The warm cake acts like a sponge and soaks up all the alcohol, meaning you can make a fully "matured" cake a matter of days before the big event.
I was at a demo watching Eddie Spence MBE, maker of royal wedding/birthday/jubilee cakes and all round cake decorating legend and this was one of his gems for the day.