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Mix the garlic, yogurt and lemon juice together in a bowl. Season, then loosen with 1 tbsp cold water if it seems too thick. Warm the flatbread in the toaster, if you like.
Put the flatbread on a piece of baking parchment and top with the spinach or lettuce. Arrange the falafel in a line down the centre, then top with the cucumber and tomato slices. Add the gherkin, cabbage and a drizzle of chilli sauce, if using. Spoon over the yogurt mix.
Use the baking parchment to help you fold in both ends of the wrap, then roll tightly into a burrito shape. Cut in half through the baking parchment using a bread knife, and tear it away to eat.