Hi I had a NT test done at Leeds Screening Centre - very nice centre and the lovely sonographer spent a fair bit of time doing the scan and showing me the baby which the NHS scan the week before hadn't done. They are a bit expensive but they could see me on a Saturday when time was running out.
ahem I think it was about £190 - it was very good - that did include the blood tests as well. I'd been quite worried about the risk of downs - which the sonographer immediately said I wasn't at a high risk for really at 35.
They were really nice there and it had a lovely atmosphere.