I haven't been to many farm shops but I would assume that the meat they sell would have been reared on that farm - it's not at all cheeky to ask though, normally they are happy to tell you about it.
Recipe for beer barley beef done in the slow cooker:
Sunflower oil
625g / 1.25lb lean stewing beef / braising steak
1 onion, chopped
1 tbsp plain flour
250g / 8oz carrots, diced
250g / 8oz parsnips or potatoes, diced
300ml / half a pint light ale
750ml / 1.25 pints beef stock
mixed herbs
100g / 3.5oz pearl barley
salt & pepper
The recipe says: Brown the meat in the oil in a frying pan, remove the meat with slotted spoon & put in slow cooker pot. Add onion to frying pan, fry for 5 min, mix in the flour, then add diced vegetables and beer, bring to the boil and then put into slow cooker pot. Pour stock into frying pan with herbs, salt & pepper, bring to the boil, then pour into slow cooker pot. Stir in pearl barley, put lid on, cook on low for 9 - 10 hours.
In reality, I have tried following the recipe, and I've tried the "chuck it all straight into the slow cooker" approach, and found very little difference. I didn't put the flour in when I did it that way, or it would have made it lumpy. I waited til the end, and to thicken it - and I am giving away my top cheat's tip here - I add a bit of instant mash.
I wouldn't worry about following the recipe to the letter, it's pretty forgiving. You can leave out the beer too if you like. The only thing I'd say is that 10 hours is a long time to cook, so it'll need to be on by 8am if you want to eat at 6pm - for me, this means preparing the veg the night before.