I thought it was a shame in last night's episode that after such a powerful story (particularly the bit where they actually carried out the illegal abortion) they then tacked on a happy ending with the whole family roaming the fields of Harlow, Sound of Music style.
In the book, iirc, the early abortion doesn't work (which was the same as in last night's episode) but rather than have a late abortion, the couple just kill the baby after it's born.