Tinned mackerel spaghetti with lemon chilli breadcrumbs

Name: Tinned mackerel spaghetti with lemon chilli breadcrumbs
Ingredients: 200g/7oz spaghetti; 110g tin smoked mackerel fillets; 50g/1¾oz slow-roasted cherry tomatoes, packed in oil; 1½ tsp extra virgin olive oil; small handful flatleaf parsley, roughly chopped; ¼ lemon, juice only; freshly ground sea salt and black pepper; 1 tbsp extra virgin olive oil; small handful fresh breadcrumbs (1 small slice bread, blended, if homemade); ¼ tsp dried chilli flakes; ¼ lemon, finely grated zest only