Can anyone identify this bushy tree please?

This bushy tree is set in a row with some fruit trees. Can anyone please tell me what it is and how to prune it. Thanks x

 

Does it have thorns? Looks a bit like a blackthorn but would need a closer photo to see. Can you post pics of the leaves and trunk?

 

I'm sure it's Blackthorn ,I can just make out the Sloes

 

No thorns and fruit :/ Here's a better photo of the leaves

 

It looks a bit like the alder trees in our back garden

 

Think Lolli is on the right track, some kind of prunus, possibly plum, or damson.
Dammed if I can see the fruit, but then I am a bit sloe at times.