I think it's a good idea. I have no idea of what happens in Britain, but in the US, adoption isn't promoted as much as abortion. So when a teen gets pregnant, she'll either keep the kid or abort him. If she keeps him, they're in for a life of poverty and possible abuse if she marries the dad and he's an ass. If she aborts, she'll be fine, but the kid obviously dies. Adoption would give both a decent life because the mom doesn't have to drop out to care for the baby, the baby isn't being raised by a single mother working 2 jobs to pay rent on a rat-infested apartment, and as a bonus two strangers who for whatever reason cannot have a baby get a baby to love. There aren't any losers here.

So promoting adoptions and fixing whatever it is that seems to be making adoption less of an option would probably go a long way to reducing abortions (and probably spending however many tens of thousands of dollars on fertillity treatments or overseas adoption). Of course preventing pregnancy should be a part of the plan too, but you need a backup.