This is the one I use but there are lots of variations. Also I prefer it chunky not blitzed, but each to their own.
3-4 carrots sliced
1 large onion chopped
2 peppers chopped
3 parsnips chopped
2-3 leeks chopped
1 tin mixed beans
1 tin baked beans
2 tins chopped tomatoes
1 tin green lentils
handful or two red lentils
2 chicken stock cubes
2 veg stock cubes
Place all in pot and add water to about level of veg and cook till biggest veg is tender. Season as required.
Makes a huge pot full and it freezes really well. I find it does help losses but possibly cos it's so filling you just can't eat anything else after a bowl or two of the soup.