How many wedding cakes did Prince Charles and Lady Di have for their wedding?

Explanation

The couple had 27 wedding cakes with the official wedding cake being supplied by the Naval Armed Forces. It took 14 weeks to make the cake, and the bottom layer took 12 hours to bake. 2 identical cakes were made, just in case one was damaged in transit. The cake was undamaged and the standby cake was distributed amongst the naval cookery trainees. Each got 2 pieces, one for the trainee and one for their mother.