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Heat a 24cm non-stick ovenproof pan and fry the bacon rashers in batches on a high heat until cooked through and crisp. Chop 4 roughly and break the other 4 into large pieces. Set aside on kitchen paper and clean the pan.
Heat the grill to high. Warm 1 tbsp oil in the pan. Season the eggs, add the chopped bacon and pour into the pan. Cook on a low heat for around 8 mins or until almost set. Arrange the avocado slices and bacon shards on top. Grill briefly for about 4 mins until set.
Mix the remaining oil, the chilli, mustard, vinegar and seasoning in a large bowl. Toss in the salad leaves and tomatoes. Serve alongside the frittata, cut into wedges.