Go watch the Superman making-of featurette. Henry Cavill, the actor playing Superman, is English. I know you know this, but still, it's wonderfully unnerving to hear him talk. He went to a boarding school in Buckinghamshire. He did prep. Superman was nurtured not on an alien planet, but in the Home Counties.
Over dinner on the terrace of the Chateau Marmont Restaurant I finally got to ask Purple Mafia about their time in Hollywood. Still buzzing and smiling from their day in the studio, the boys are talking about their day. I asked them what their first impressions of Hollywood were, laughing Josh said "the weather is nearly as hot as the girls"