Yorkiegirl - try this, it's what ds has for dinners this week :c)
1 tbsp vegetable oil
1.5 small onions
25g celery
50g red lentils, washed and drained
275g carrots, peeled and chopped
450ml vegetable stock or water
50g frozen sweetcorn
60g cheddar cheese, grated
Heat the oil in a saucepan and saute the onion, carrot and celery for 2 - 3 minutes. Mix in the lentils and pour over the stock or water. Bring to the boil, then reduce the heat and cover and cook for 20 minutes.
Add the sweetcorn and cook for a further 5 minutes. Stir in the cheese until melted, then puree.
Good old Annabel Karmel