I am concerned about young girls (who will be at various stages of puberty, some not even having reached the menarche) having access to any hormonal contraception simply on chronological age and without medical monitoring.
Not that they should be denied access, rather that there is a greater need for monitoring (ideally by a specialist nurse, also CP trained and alert to possible abusive and coercive situations). I also think that if the Pill is wanted to regulate periods, that should be done by the GP, not via self-diagnosis and experimentation OTC (different formulations between pills might be very important in those circumstances)
I don't however have any particular difficulty with the idea of easy access to effective contraception to younger teens. I lived abroad in a place where anyone could buy the pill OTC (not even a pharmacist check). There was a much lower rate of sexually active teens there, and I believe that was down to the attitudes and norms of the community in that specific location.
Reductions in the numbers if sexually active teens is something I would very much like to happen, but I think that needs to be tackled on many fronts other than the availability of contraception.