Eight to ten hours homework a week for a 14-year-old does not seem that excessive to me. As it presumably includes the weekend, you would be looking at an hour a school night plus three to five over Saturday and Sunday, and no doubt some of that homework will include reading etc.
However, what I would say is that a lot of pupils' "academic strain" comes from the accelerated pace of learning and teaching between 14 and 18 that seems to be built into the British qualification system, particularly as it comes at a time when young people tend to go a bit loopy because of their hormones.
When I taught in other European countries, there seemed to be a stronger and deeper academic foundation at primary level that mitigated, to an extent, against this four years of panic and anxiety we see in Britain.
Orlando, Hakluyt ... I work in a RG university. A better way to describe the non-academic factors that have weight when it comes to admissions to RGs would be say that successful students show evidence of a personality that will work well within the cohort for that course. RG universities offer places to people, not grades, because they are not primarily "recruiting universities" -- or academic admissions tutors do not think about their institution in that way.
Some of the most successful personal statements I have seen have been ones where the personality of the student shows through. DoE doesn't really say much about an applicant compared to, say, running a youtube channel devoted to YuGiOh!
It also doesn't not necessarily have to be something that a prospective has done, but what they would like to do ... so saying in an interview that they would like to get involved in the student radio station or develop the geology society.
When you are faced with hundreds of applications for a course that only has five places (as is the situation with one of the courses in my faculty), everyone that applies will have a predicted three A*s and the usual extra-curriculars. So, instead, admissions tutors look for something different to that, something that makes an applicant stand out, and it really could be anything.