Italian roast chicken cobb salad

Name: Italian roast chicken cobb salad
Ingredients: 1 lemon halved; 1 medium whole chicken (1.5kg); 2 garlic cloves; ½ bunch of oregano leaves picked and chopped; 4 tbsp extra virgin olive oil; 300g vine cherry tomatoes; 10 thin slices pancetta; small bunch of basil leaves picked; 150g pitted olives; 2 Little Gem lettuces cut in half; 4 eggs soft-boiled for 7 mins, then peeled and halved; 1 large ball of buffalo mozzarella; 120ml extra virgin olive oil; 1 heaped tbsp Dijon mustard; 1 lemon juiced; pinch of sugar