Just spotted this - name at the top and have gone past it several times without noticing! Variations on a theme:
2lb carrots, 1 onion - dice and sweat. Add 1 tin chopped tomatoes, black pepper, mixed herbs (I use Barts mediterranean herbs in olive oil). Add 2 pints stock. Cook for 25 mins (ish). Whizz with blender.
Roughly speaking 2lb veg to 2 pints stock.
Use same methodology for leek & potato, carrot & sweet potato (1lb of each plus add 1 tbsp white wine vinegar pre-whizzing), courgette & leek (2lb courgettes, 2 leeks (any size) 2 1/4 pints stock - courgettes release a lot of water), carrot & parsnip.
Roasted veg soup involves roasting 1 yellow pepper, 6-8 (ish) ripe tomatoes, 1 red onion (white will do), 2-3 carrots, herbs, black pepper in 200C oven for 30mins. Add two pints stock and whizz.
Not rocket science but fantastic way of eating well and my children love it. Lots of domestic goddess feelings!