Harris Dickinson, the talented actor who made such a memorable impression in last year’s “Beach Rats,” is adored by director Steve McLean’s camera in “Postcards From London” — but it’s all for a ...

“Be down in a minute!” a cheery voice crackles through the intercom. It’s a balmy late July afternoon in east London, and I’ve just rung the buzzer of an old schoolhouse, now a hub of offices for ...