Lighter chicken tacos

Name: Lighter chicken tacos
Prep time: 35 min
Cook time: 25 min
Total time: 1 h
Cuisine: Mexican
Ingredients: 2 tsp rapeseed oil; 1 tsp ground cumin; 1 tsp smoked paprika; 450g skinless chicken breasts, preferably organic; 4 medium tomatoes, preferably on the vine, halved; 1 red pepper, quartered; 1 small red onion, cut into 8 wedges; ¼ tsp rapeseed oil; 2 tsp lime juice; ¼ tsp ground cumin; good pinch of chilli flakes; 2 medium-sized ripe avocados, stoned, peeled and roughly chopped; 4 tsp lime juice; 2 spring onions, ends trimmed, finely chopped; 3 tbsp chopped coriander; 8 corn tacos shells; 8 tsp 0% Greek yogurt; 2 Little Gem lettuces, shredded; chopped coriander; lime wedges, for squeezing over