Mumtryingtodoherbest - I am going to support Howabout in her statement that "It is not my experience that DC are exclusively academic, artistic, musical or sporty."
This is not rare.
I know many kids at ds' school who are extremely talented at various sports (representing the school at swimming, running, rugby, gymnastics, doing other sports outside school like cycling, doing well at a national level too) yet who are also in the top sets for English and Maths and get excellent exam results.
Ds is one of the them - doing well in his exams but also a committed (and talented if I say so myself
) sportsman, training or coaching (passing on his skills) 5 days a week.
I also know kids from the school who were in top sets who have won places at highly competitive Art Schools. Ditto with talented musicians and actors.
The school is very proud of its highly mixed demographic of its pupils (from the offspring of millionaires to asylum seekers and children who literally don't know where the next meal will come from), how it ensures that no one loses out because of financial constraints (supported in this by its Parent Teacher Council) and how it copes with the 54
languages spoken by pupils at the school.
The school strongly encourages the development of rounded individuals: so while it expects a lot from its pupils, it doesn't concentrate on exams to the detriment of sports, artistic efforts and contribution to society (ie volunteering). It is its experience that such kids will be more successful in the long term (very low drop out rate in the first year at Uni, for example).
I also see ds' friends (from his rugby and cycling clubs) at other schools across the city and surrounding area, doing similarly well at both sports and exams.
The difference that howabout and I share is that we both live in Scotland where we have had a truly comprehensive system for c40 years. 
Despite - or because - of this, in Scotland we have a lower proportion of pupils in private schools. The only exception is Edinburgh where it is arguable that the high proportion of private schools creams of the best kids and creates a self-perpetuating market
. Just like grammar schools 