Hi
I had the Harmony package you are describing and it was worth every penny to me.
I was very anxious and was going to book early scan anyway so the packsge for us had great value.
Im not trusting NHS at all, i lived in US for long time and the healthcare is just on much better level so my expectations are different.
Im glad did not wait and rely on NHS.
Essentialy you need to realize that from NT scan might get risk results with which you might not be happy to live with. The age skews it a lot. So if you are over certain age you just will not get lower numbers.
Harmony or NIPT is most accurate, then NT combined and then tripple test.
I have my risk results from all the above test and can tell you how they differ.
NHS booked my NT scan on last possible day of performing this test 13w + 6.
But when I came they dated me 14+5 and test could not have been performed. I had to wait until 16w to do tripple test and got results at 18w so very very late. I would have died with worry if I would not have harmony already.
Regarding the scan, there was huge difference, NHS checked baby leght, heartbeat and head circumference. And told me my pracenta is low anterior..
Private scan checked all this plus many extra soft markers for Down and all organs, spine, stomach etc, so you know all this at 12w and dont need to worry as much for anatomy scan as you know your baby already has all those organs. Placenta was high posterior.
Later went to a fetal specialist overseas who did my anatomy scan at 18w and confirmed placenta same as private scan, opposite to NHS.
If you are worrier and want to know soon it will be worthy for you so you can move on and enjoy this wonderful time.