Thanks for the good luck wishes 
...and it's good news (phew).
One very active fetus clearly visible in the scan and measuring 13 weeks and 5 days - so I'm a good week and a half further on than I thought (I was two weeks out in my estimates for DD, so it seems to be par for the course with me..!) Two days later and I wouldn't have been able to have the T1 screening.
That, of course is the next obstacle - I'm now hoping I won't have a phonecall from the specialist midwife in the middle of next week. I went through all that with DD and don't want to again, if I can help it.
The nuchal fold measurement was about bang in the middle of the normal range, so no clues there, really. It took two trips to the loo from me until the sonographer could get a measurement as my bladder was too full 
"Can you empty half of it out, please?" she asked. How can you tell you've done half your wee?!!
I'm now convinced I have been feeling small fetal movements. Before the scan, I suspected we would see an extremely wriggly fetus as that's what it feels like, and so we did. DD was much more laid back, she had to be nudged very firmly before she would change position so the sonographer could get a decent picture. This one wouldn't stay still for two seconds.
DD stayed at home 'cos DH doesn't have a lesson first thing today, so was allowed to go in a bit later. I opted not to bring them along as a dull trek across town in the rush hour both ways wouldn't have led to a happy toddler and I think I made the right decision for all our stress levels.
Made DD sweetcorn fritters for lunch (which became sweetcorn pancakes because the mixture was too stiff, so I added milk) and she loved them. The sweetcorn was whizzed up, which is probably why she ate it happily. She doesn't like it whole. Still, nice to have a variation on a theme that she likes and is easy to throw together.