I am considering taking a trip to England this summer to check out a university. For money (and experience) purposes, I would prefer to travel alone. My plan is to fly on Primera Air from BOS to STN. According to Primera's site, I should be fine flying with them alone as a 17 year-old, but will entering the UK pose an issue? All I've found is a page on gov.uk that only seems to apply if you are applying for a visa, not if you are entering visa-free (as I would be from the US).
I do have friends in the UK that I would be staying with.