Actually I do know of girls who have had offers at both. Probably means that HBS will be even more competitive this year if certain applicants failed to get places at the independents.
This may well be because there's quite a number of partially selective schools in the area. Siblings who would normally only have applied to them may well be protecting themselves by applying to the independents and state selectives.
When I was at NLC the head stated that the school had not seen such high standards on entrance papers before. I must say I am surprised some children I expected to get through the first rounds did not, perhaps it will be more difficult to get places this yearbecause of the changes on the admissions code.