Talkinpeece - The government formally classifies Dame Alice Owen's school as a comprehensive. You're making up your own definitions if you're going to exclude faith schools, single-sex schools and schools which prioritize limited numbers of "talented" pupils.
Btw, what do you mean, date of birth only? Afaik, the vast majority of schools use distance for their oversubscription criteria, with only a few going to lottery.
That said, I was clear that DAO takes up to 37.5% of its pupils on a selective basis. It does take at least 62.5% of its pupils on distance. Even if all of its 1.7% FSM eligible children came from the "non-selective" portion, that would only represent 2.7% of those pupils. The average independent school provides more full bursary/scholarship combinations than that.
DAO is one of the worst "comprehensive" secondaries in terms of having few FSM eligible pupils. But, as a PP pointed out, I could list hundreds of primaries with 0-3% FSM eligible pupils.
xenia is absolutely correct that (to paraphrase Theresa May) the state system allocates good school places by house price.