Southend seafront police harassment

I have just bought my son a van from a chap who lives on the Kursaal estate, Southend seafront. My son, slightly worryingly,  reliably informs me this is where the drug dealers and prostitutes who have done slightly better for themselves live. Upward mobility from a crack estate.


We do the deal  and with some relief drive away onto the seafront. It's late, I'm tired and want to get home. As I'm driving along become aware the passenger door is open, as I can't reach the door handle from inside pull over.


Am aware of a driver behind me also pull up.  Has he been following me?