I am a full-time private tutor and tutor children from a wide range of backgrounds.
I realise it's hardly a scientific sample, but ime, Asian families (and other non-white British backgrounds for want of a better way to express it) will often pay for extra help and support outside of school, even when they are relatively poor and they will invest in it long term, not just for a couple of weeks before exams. My theory is that having relocated from elsewhere, there is a bigger interest in the children being able to fulfill the potential that the move afforded them (even if 2nd or 3rd generation, they are often more aware of the opportunities out there etc), whereas there is maybe more of a tendency from white British from poorer backgrounds to "accept their lot", to not aspire to as much etc. I think it's probably associated with the typical class-system, not to aspire to ideas above your station etc. I remember once a teacher saying about ds1 (aged 6 at the time, " he thinks he's something special " (said in a not nice way). My reply? "They should ALL think they are something special" - his dare society try to manage the expectations of a child so young already. (And yes, I think it is society, not just that particular teacher. I think she was simply voicing what many others think - children from certain areas, certain backgrounds etc shouldn't want too much, expect too much, get too many ideas about themselves etc).