Hi again, gehr.
I’m amazed you say you are ‘historically bad at essay writing’! You seem to me to be very articulate, and more than able to express yourself effectively. The effects of school avoidance, for whatever reason that may have been, are clearly a thing of the past.
If you’re a Y11 student, about to sit GCSE exams, then obviously you’re focusing on those at the moment. A Level choices can likely be finalised on the back of results in August.
You seem to be planning a long way ahead, if you already know the topic for your PhD! It’s great that you’re thinking so clearly, but make sure you deal with the present and immediate future, before spinning out too far.
It seems to me that you like to be in control of things, in your own mind, in order to make the best decisions. This is a good thing, largely. If you’re planning on doing Linguistics at uni, bear in mind that you don’t need to have done A Level English Language. The course would give you a broad idea of the subject area, but it’s not essential. Besides, as an extra ‘pair of eyes’, I’m not convinced that Linguistics would be the best degree option for you, given your reservations about necessary aspects of it.
A Level Philosophy, as an independent subject, without the RE elements, may not suit you, either. As I’ve said, you seem to prefer facts and definition; choosing Economics proves this point. I wonder if Philosophy might frustrate you, in its abstract and subjective nature.
I suspect that – as A Level choices – you would be wise to consider English Literature. Depending on the texts your college teaches (though there’s a substantial element of self-choice in the NEA), you might find that would give you the scope for discussion, philosophical and analytical, you are looking for. In addition, the features of Literature study you both enjoy and feel confident in make it preferable to Language.
Your Russian studies suggest a heavy workload outside of college. Don’t be the student who takes too much on, and becomes OK at a lot of subjects, but not great in any one of them.
As a third option, given your uni aspirations, how about Politics? A complement to Economics and Literature, and maybe useful to you in UCAS applications. Does Law appeal at all? If you don't mind hard work, it's a good discipline to study. Psychology?
As for uni courses, Glasgow and SOAS are decent choices. Other options (based on a very peripheral trawl on the internet) indicate degrees in Linguistics and International Relations. Look at Nottingham Uni, St Andrew’s, UCL, Bath Uni, MMU, and Leeds Uni. Leeds, especially, seems to declare some expertise in the area of endangered languages and cultures, which you hope to pursue in later years.
Anyway, just some thoughts, gehr. You are an interesting student.