Shop around, ask friends who they have used at their wedding, check that the businesses you choose have full insurance and any necessary certificates. The cheapest option isn’t always the best option.
I recently created a very elegant four tier wedding cake and was asked to include a hidden element at the back of the cake - models of the bride and groom wearing their football team shirts, as if they were peeping out under the fondant. The couple knew nothing about it until they saw the cake and they were absolutely over the moon with it.