You could always try gravy browning - mix into a paste with cold water then add boiling water and heat gently on the hob (alternatively add the paste directly to the stew and let the cooking thicken the sauce - like the cornflower method; mix into a paste first otherwise you'll get loads of lumps!). It will thicken rapidly and can be added to the stew to help reduce it.
I hold the idea of winter stews in high esteem, and once you've diced all of you ingredients all you really have to do is give it a bit of a swirl with a long spoon every now and then.
off the top of my head, lamb stew:
dice shoulder of lamb
potatoes
carrots
onion
leeks
celery
mushrooms
parsnips
swedes
beer (dark stouts etc)
salt
black pepper
mustard powder
mixed herbs
bay leaf(s)
tomato purée (not too much of this)
bisto or gravy browning
stock cubes (veg or whatever)
barley oats (if they're dried, soak them in water for at least 24 hours or you'll break your teeth on the first spoonful)
Add as much or as little of ingredients as you see fit, whack the whole lot into a
large pan, top up with cold water (least until all the ingredients are covered and then some) then cook on a low heat for several hours. Due to cooking time you may consider adding some of the veg (like the potatoes, carrots parsnips) later on in the cooking so they don't turn to mush.
Don't forget those dumplings now...
