Thanks for your suggestion. Yes I will get the NHS one but as my 12 weeks will fall the week of Christmas i might not get a scan until January. Ideally I'll like to share news with family before Christmas.
got you, I think the range is actually something like 11 weeks and 2 days to 14 weeks and something - not sure exactly but doesn't actually have to be in the 12th week i believe so you could ask them to do it the week before Christmas, possibly. They will try and fob you off, I'm sure, so you could say you were going away for Christmas and woulbt be back until midddle of january ....
otherwise the Foetal Medicine Centre in Harley St is very good, think my scan was around PS120 but that was a few years ago.
Definitely FMC - we had a viability scan there at 7 weeks. We're so lucky that our local NHS antenatal dept is also run by them, same doctors and sonographers. They were great at both our viability scan and our (NHS) nuchal scan.