Fruit identification help please
in Fruit & veg

I walk past a small tree/massive bush laden with this fruit, and want to know if I can take advantage! Fruits now ripening, starting to fall to the ground. The fruits are about the size of grapes - teaspoon shown for scale! - and have a whitish powdery blush which is mostly rubbed off of the ones in this image. Leaf from the bush shown too, though it's the underside. Anyone able to identify? And is it edible/tasty?
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How big is the bush and is it in someones garden or definetely wild growing?
I think they are blackthorn berries which as far as I know are not edible mainly due to their taste.
Thanks for all your suggestions folks - see pic of one cut open and stone inside. Definitely looks/feels very plum-like to me, so Damson suggestions would make sense. My wife also saw some people picking them yesterday, so hope we're not too late! Looking online it seems August is a bit early to be picking, but if it's an early variety as one of you mentioned they might be ok? Thanks again!
Or or if the bush had sharp spines its a blackthorn and those are early sloes ... if so they need to be frosted so put them in the freezer for a few days before buying whichever gin is on special offer and start making Sloe Gin 🍷