You should be offered one if you are over 35 but it will depend on your area. I had to pay for both of mine and when I asked to have one at the hosptial that I gave birth to dd in (and will again this time) I was told no. My preggers friend has just had one done there (it's 20 miles away) for free whereas mine cost 99 for dating scan and 186 for oscar.
most hospitals are now offering the nuchal screen/combined test at the same time as the dating scan. it is the goverments aim that all nhs hospitals should be offering a nuchal by march 2010. in 2007 only 30% of nhs antenatal clinics offered the nuchal screen as part of the routine dating scan. it is taking time to be rolled through out as sonographers have to have another course to do the nuchal scan and as in most nhs jobs there arent enough sonographers at the moment, and obtaining funding to train more is not easy.
can you tell i just did an essay on nuchal transclucency screening!