UPDATE:
I got my remark back for Edexcel's 6HI03E (a level history Cold War option) last week, and it came back at exactly the same mark - a high-ish C, with 22/30 on the first essay and 20/40 on the second.
However, I got my paper back yesterday and read through it, and I am 80% sure i've been drastically under marked - probably due to poor handwriting. It is legible overall, but there are places where it takes a minute or so to decipher a word, which I think have meant the examiners who marked and remarked my paper haven't been able to follow my arguments.
I don't think this is righ tthough, and I've emailed my history teacher with the photocopy script and a typed up version of my answers, complete with all spelling mistakes/mixed up sentences to reflect the actual exam. If he agrees that I've been significantly undermarked, we're gonna appeal.