SFX - confusingly, there are two different places with similar names:
The Fetal Medicine Centre - Kypros Nicolaides mob - he is the world leader in fetal medicine research and he invented the fetal scan. He also invented the CVS test and the nasal bone test.
It is £150 for an integrated scan at 12 weeks. You get the results immediately and its 95% accurate. All the staff are trained by Nicolaides and all profits go to the research charity.
There is also the Queen Charlottes mob who, confusingly, have called their relatively new private unit the "Centre for Fetal Medicine" They are much less experienced, but are also a private clinic. When I asked them what their miscarriage rate was for CVS's they said they hadn't done enough of them to be able to give me a figure (I suspect their figure was quite high and they just didn't want to say so) .
On the other hand, if you go to the Fetal Medicine Centre, Proff Nicolaides personally does all CVS's himself and the risk of miscarriage is much lower than the national average 1% risk. I realise you want an intergrated test (nuchal scan/blood tests)not a CVS, but a poor test result might lead you to want a CVS IYKWIM. Nicolaides has all the cutting edge technology there as well and his scanners can also do 3d imagering. The scan is extremely detailed and included the new nasal bone test (QC centre were completely ignorant of the nasal test when I asked them about it)plus about a 40-50 minute long cardiac examination.
I would strongly recommend you use Nicolaide's FMC if you want the most accurate result, as he is the world expert so to speak and has better technology. As well as getting the results on the spot, they can offer you the best possible service if you do get a poor result, as they are at the cutting edge.
Its worth every penny of the £150