Found in a bag of Wild Rocket salad

Found in a bag of Wild Rocket salad

Observation - Found in a bag of Wild Rocket salad - UK and Ireland. Description: I was surprised and intrigued to find this little beetle? in a bag of Wild Rocket from a supermarket. I wonder if anyone can identify it and say whether it is harmful or not.

I was surprised and intrigued to find this little beetle? in a bag of Wild Rocket from a supermarket.
I wonder if anyone can identify it and say whether it is harmful or not.