Haddock and bean chowder

Ingredients

• 1 teaspoon olive oil
• 1 small leek, thinly sliced
• 1 clove garlic, finely diced
• 1 small courgette, sliced
• 6 medium-sized new potatoes, quartered
• 1 x 198g can salt-free sweetcorn, drained
• 500ml skimmed milk
• ¼ teaspoon salt (optional)
• 1 bay leaf
• ¼ teaspoon cayenne pepper (optional)
• Freshly ground black pepper
• 200g haddock (or other white fish), skinless, cut into bite-size pieces
• 400g beans, such as haricot, flageolet, cannellini, or butter beans, drained and rinsed
• Small handful parsley, chopped
• ½ lemon, cut into wedges