Previously (2008) Dean spent time in Prison for perverting the course of justice. He was bullied and beaten there.
His return has shown him involved in illegal activity. He acquired a number of mobile phones and tried hiding them in his Grandad's washing machine. When the police came knocking, he couldn't have gotten out of his Grandad's flat faster. Stan is arrested allowing Dean to run.
General observations and questions..
When we see Dean and his Grandad talk the first time at the table, Stan refers to "him" He says, "So what have you nicked from him?"
They also refer to "Annie" this seems to be his girlfriend - now presumable ex - who he cheated on with her best friend.
He claims to be storing the mobiles "for a friend" who he then confesses is Annie's brother.
So... Him = !Dean claims! is Annie's brother who "has a different idea what 50-50 is"
Stan returns to stay at the Queen Vic after being arrested. Dean is hiding nearby and Stan tells him that Dean owes him a favour ,a big one, which he will be calling in soon..
How much of a dark side does he have?
What else could Dean be involved in?
Could he have been Lucy's dealer?
Was there any way he was stashing something at the flats that LB lettings were trying to rent out? If so, could Lucy have found them/be involved?