Waiting, waiting, waiting for broad beans

in Fruit & veg
I keep picking my broad beans but they are tiny inside.
I only have one plant so don't want to waste them ... someone gave me a seed so I could give them a go and see if I like them.
When will I know they are ready - what size will the pods be when they should be picked?
Thanks.
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Try stopping the head of the plant when most of the flowers have set.Also make sure moisture levels ok.Stopping has the added benefit of stopping blackfly , a curse of BB's from taking over.
You can tell how big the beans are inside the pod by a gentle press on the side.
If you can not see any swelling leave alone.
I would have purchased a pound or so from your grocer to see if you like them, a lot quicker but perhaps not so much fun.
Oh I know I like to eat them, this gardening friend wanted me to have a go at growing them.
I've pinched the tops out already.
You see, this is my prob ... to my eyes the beans feel like they should be massive inside. I guess it's trial and error.
I'm gonna go in search of some visual clues by asking Mr Google.
Thanks for your reply.