Summer fish stew

Name: Summer fish stew
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: European, British
Ingredients: 4 slices stale bread diced; 2 tbsp olive oil; 1 onion finely chopped; 2 garlic cloves crushed; 1 tsp dried chilli flakes; 400g can chopped tomatoes; 4 frozen white fish fillets, such as cod or pollock; 400g can butter beans drained; small pack parsley roughly chopped; 1 lemon cut into wedges