Cauliflower Soup with Rarebit Croutons vegetarian

Ingredients

• 1 medium cauliflower, broken up into florets
• 2 tbsp butter
• 1 leek, white only, finely chopped
• 300g potato, peeled and diced
• 1 sprig of thyme
• 1 sprig of rosemary
• 2 bay leaves
• 750ml vegetable stock or water
• 500ml double cream
• maldon salt and freshly ground black pepper
• 300g mature cheddar, grated
• 100ml milk
• 1 tbsp corn flour
• 1 tsp hot English mustard
• 1/2 tsp Worcestershire sauce
• 6 slices of bread, lightly toasted