Chicken skewers with tzatziki

Name: Chicken skewers with tzatziki
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Cuisine: European, Mediterranean, Greek
Ingredients: 4 skinless chicken breasts; 1 lemon; 2 tsp oregano; 1 garlic clove; 1 small yellow pepper; 1 small red pepper; wholemeal tortilla wraps, to serve; baby spinach leaves, to serve; few sprigs flat-leaf parsley to serve; ½ cucumber; ¼ garlic clove; 4 tbsp Greek yogurt; 1 tbsp extra virgin olive oil; eight bamboo skewers olive oil