A few observations so far.
For background, we really started down this path seriously when a representative from St Andrews showed up at our HS’s College Fair sophomore year. I’ve done a lot of research and we remain very interested in St Andrews specifically, and perhaps other Scottish universities. We are currently not likely to apply to English universities, although nothing is decided.
To explain that, it turns out that there is a fairly clear spectrum in terms of how accommodating UK universities are to US applicants. Oxford, for example, seems fairly accommodating in that they will typically let you substitute four AP 5-scores, or a combination of three AP 5-scores and a high enough ACT/SAT score, for the three “A-levels” they normally require for admission to a given course. However, this is still a bit of a problem for us in that our HS doesn’t offer many APs, including required ones for our possible courses.
Oxford also uses a very important interview phase to select the actual admits, and while that is very understandable it adds an element of stress and uncertainty. Finally, you can apply without all the necessary AP scores yet, planning to take them as a senior, but then they will likely only give you a conditional offer. And that can be a little nerve-wracking if your conditional offer depends on scoring 5s on specific AP tests at the end of your senior year.
Cambridge in turn seems notably less accommodating to US students. It typically requires five AP 5-scores AND a high enough ACT/SAT. The APs also have to be in your junior or senior year, which implies it is far more likely you will end up with a conditional offer. It also seems to have more special entrance exams than Oxford, which are only offered at a few test locations in the United States. I note Cambridge also specifically states in response to the issue of a HS not offering AP classes that it does not see this as a barrier as you can still sit for AP exams anyway, as a self-study student.
To us it seems like at the opposite end of the spectrum from Cambridge are the top Scottish universities, like St Andrews, Edinburgh, and Glasgow. They explicitly state on their websites that while a variable combination of relevant AP scores (which can be 4s in some cases, although sometimes 5s are required in specific subjects for specific courses) and SAT/ACT scores (with lower minimums) can satisfy their requirements, they understand not all US students have such APs available, and therefore as appropriate they will consider high grades in advanced courses instead.
And in fact, we specifically discussed this with the St Andrews recruiter (he came back junior year), and he assured us that applicants from our school do not need to take AP exams for courses we do not offer, although he did say typically our successful STEM applicants had taken a calculus AP (which we do offer) and submitted ACT or SAT scores (but even those are optional).
Finally, I note St Andrews and Glasgow are actually both on the Common App (there are 23 UK universities in total on the Common App, including many others a US student might consider). You can also use the UK’s somewhat similar UCAS system–but not both!
And I note the St Andrews recruiter said that while either is fine, using the Common App was often helpful in his view because it made the US applicants stand out, and gave us a chance to really explain specifically why we were interested in that course at St Andrews (they have an essay for that).
And I further note it seems many US students who use the Common App to apply to St Andrews early enough in the fall then typically get an answer fairly quickly, and often if they get an offer it is an unconditional offer (even if, say, they still did not have all the planned AP scores). I also note that “restrictive” early action rules typically exclude non-US colleges. So, for example, we are thinking of applying to a REA college, rolling admission at a public university (also excluded), and St Andrews as our “early” schools.
In short, it appears that St Andrews really wants US students to apply, and is very accommodating to US students they think meet their academic qualifications. So are the other top Scottish universities. And there is a financial reason for this–Scottish students pay even less for Scottish universities than UK universities generally, and so US students paying the overseas tuition really help balance the books.
But also, I think they recognize this is an opportunity to pull in some academically-promising but “unhooked” US students who may not get into their favorite US schools. And in fact, if they can get out an unconditional offer early enough, they may have a longer opportunity to try to seal the deal.
So that is a lot of our current thinking. I’d be very interested in what others are thinking, and of course to hear from those who actually went through this process in the past.