Bogsyripply, you must be devestated, but it is good to see you on here, as there are others who have been where you are, and who will understand exactly what you are going through.
In response to Thomas would assume that the high rates of termination are partly in response to the advice given by medical services. We have a nuchal scan which came back with a very high risk factor for ds2, 1:2, and I was repeatedly invited to book a termination, by the person doing the scan, by my midwife, and GP. Although the question was neutrally worded, the tone of voice, the fact that they kept asking, and the assumptions being made about the difficulties we would face, was quite overwhelming.
Talking to other parents (mainly online) of children who have downs syndrome, we decided not to terminate, and not to have further tests. I was already in love with the little bean I had seen on my neuchal scan and wanted him. It was not an easy time. We were fearful, and felt very ill prepared, but encouraged by the communities of parents we met, not least on MN.
In the end, our baby was born without ds, but I retain a sense of frustration that I felt at the lack of neutral support given by those who should be able to inform us, at this time.
Best wishes and thinking of you.