Johnny arranges for his new pizza oven to be installed in his restaurant by Gary. According to the terms of their agreement, Gary is to install the oven on 20 February. He, in fact, installs the oven one week later on 27 February. As a result of Gary's breach, Johnny's planned launch of a new range of vegan pizzas is delayed by a week. The advertising flyers he had printed for the launch have to be thrown away and a new set of flyers printed. Also during that week, he had to explain to a number of disappointed customers that the pizzas were not yet available. And because Johnny had to close the restaurant on the 27th instead of the 20th (to allow Gary to install the oven properly) he had to cancel an extremely lucrative private function booked by the Vegan Food Appreciation Society, who then decided to go to a different restaurant. If Johnny sues Gary for breach of contract, how will Johnny's damages be calculated?