Pearl Barley in soup - HELP!!

[FeelingEvil]

Just about to make a soup from leftover lamb roast and whatever root veg I have in fridge.
Want to add some pearl barley - packet says to simmer for 45-60mins. Do I have to do this before adding to soup stock? Can I not just wash and simmer in soup stock for 45-60 mins?

I usually just chuck it in with the soup and let it cook with everything else Throw it in, it will be fine.

yes you can just simmer it in the soup stock

Thanks!
Off to make soup and listen to radio now.