Creamy cod chowder stew

Name: Creamy cod chowder stew
Ingredients: 200g floury potatoes, cubed; 200g parsnips, cubed; 140g skinless cod fillet; 140g skinless undyed smoked haddock fillets; 500ml semi-skimmed milk; ¼ small pack parsley, leaves finely chopped, stalks reserved; 6 spring onions, whites and greens separated, both finely chopped; 2 tbsp plain flour; zest and juice 1 lemon; 2 tbsp chopped parsley; crusty wholemeal bread, to serve