Halloumi Souvlaki with Tzatziki

Name: Halloumi Souvlaki with Tzatziki
Ingredients: * 1 tablespoon olive oil; * 1/2 teaspoon dried oregano; * 1/2 teaspoon dried mint; * juice of 1/2 lemon; * 250g halloumi cheese; * 1 red bell pepper; * 10 cherry tomato; * 1 courgette (zucchini); * 1 red onion; for the tzatziki sauce; * 1 medium cucumber; * 150g ( 1/2 cup) plain greek yogurt; * 1 1/2 tablespoon lemon juice; * 1/2 teaspoon red wine vinegar; * 1 clove garlic, finely minced; * small pinch salt and pepper; to serve; * 4 flatbread