Highly emotive subject, and one very close to my heart. I haven't read through the thread in detail, this is just my story and what I feel, in response to the OPs question.
We terminated a pregnancy at 18 weeks due to our baby having Down's Syndrome. To be honest, I am pleased to have had the choice. Our baby had cardiac problems that were incompatible with life. Without question he would have died before, during, or shortly after birth. There is no way he could have survived. People who think that Down's Syndrome "isn't really that bad, it's only a learning disability", often know no more about it than the people with Down's Syndrome they see or meet in the street.
Our baby died 2.5 years ago and even now people in RL who should know better tell me that I should have taken the pregnancy to term, that I was wrong to have had a termination, that human life is sacrosanct.
People don't 'just get rid' of babies without much thought. You don't wake up one morning and decide that because your baby has a disability you are going to end the pregnancy. We researched, talked, discussed with the consultant, looked at the test results (the ones that showed the appalling problem with our baby's heart), discussed some more and finally decided what we needed to do. The process took almost 2 weeks.
I have lost count of the number of times it has been implied that we took the easy way out. That we didn't want the responsibility of caring for our baby. Well, it doesn't bloody well feel like the easy option...there's not a day that I don't wish things could have been different.
So, no, I don't think Britain is practising eugenics - nor are the people in charge promoting it. Sometimes you just have to know when to let go.
And for the record, as far as I am aware, it is legal for a termination for medical reasons to take place at any time before the baby's due date (I might be wrong, but this is my understanding).
This is absolutely and completely distinct from abortion because the baby isn't wanted.