I'd say it was Midatlantic. More of an American "prep school" accent than a british one.
Seattle Prep Seattle Prep
Winston Churchill went to Harrow School
Stoke Brunswick School
Go to military school
harrow bOARDING SCHOOL
woo yes prep sw i go to that school . the uniform is green and blue
Shattuck St Mary prep school in Minnesota
the answer is yes ,yes prep is the top 50 school in Houston i know cause i go to that school is really great the teacher are cool and really nice they are the best! by l.l.p.s.i am a yes prep student
Golder college prep
He went to prep school, so, essentially, yes.
Churchill high school in San Antonio, Texas