OP:
You’ll have to excuse all of us Americans because a lot of us don’t realize that outside of the US, even some of the highest ranked US colleges & universities are not very well known.
I could make a good case for ED’ing to either Harvard or Brown. I also think that you should encourage your kid to write out a list of the pro’s and con’s of each school.
If your child was planning on remaining in the US after undergrad, then the answer to your question would be a clear “ED to Brown!” However, since your child is moving back to the UK after college, then the ‘name brand recognition’ factor comes into play as well.
Admission to either Harvard or Brown is very difficult to achieve.
You’d be surprised, but there are an awful lot of high school students who get a letter of rec written by some big name federal government official/senator/congressman/etc. and submit them with their applications to elite institutions like Harvard.
BUT…
if your child’s current internship w/a UK gov’t leader/elected representative/etc. is such that he or she will be able to write a GOOD letter of rec (i.e., knows specific stuff about your kid, can talk to what kind of person your kid is, work experience w/your kid, etc.), then that letter of rec is totally cool to submit.
A lot of the time, when somebody in the US is, let’s say, applying to West Point (or another US military service academy), they have to have their US senator write a letter of rec and it’ll end up to be something along the lines of “I know Johnny’s dad and if he’s anything like his dad, I’m sure he’s a fine young man and will be an asset to your institution.”
I am a big believer in finding the right fit for a kid when it comes to college. So EVEN THOUGH the Harvard brand name is bigger in the UK than Brown, it sounds like Brown would be a much better fit for your child than Harvard.
Your student should also probably be prepared to write an essay in the application asking the question “Why Harvard?” or “Why Brown?” Your child’s answer to the “Why Brown?” question will probably come across as more genuine than the answer to the “Why Harvard?” question (and you don’t want to answer that with “because everybody has heard of Harvard here in the UK”).
Being able to graduate debt free from college is a really awesome thing, so EVEN though Harvard has a better brand name in the UK compared to Brown, if you compare that to the monthly loan payments after undergrad (of having to pay back the equivalent of $100-120k in student loan debt from attending Oxford or Cambridge), graduating debt free from Brown means that your child could pretty much pick ANY job they wanted to after college graduation and wouldn’t be tied down by the “OMG I need to earn $$ per year so I can afford to live and pay off my student loans, too” panic.
…therefore, my answer is to apply to Brown.