The other side of the coin - why should the NHS spend (loads of) money on scanning lots of perfectly healthy women with low-risk pgs?
I would have preferred to get a 20 week scan too (in Glasgow so only got 12 week booking scan) but I do realise that when resources are so tight this may not be the best thing to spend money on. And as others have pointed out, there are lots of things which do not show up on scans anyway.
It is such a shame, of course, when women who would have benefited from a scan do not get one - but I would hate to be the one to decide where to allocate maternity budgets.