UK ladies - scan help needed!

Natalie
Hello! I'm 10 weeks and had my first midwife appointment a couple of weeks ago, where she wrote to the hospital to refer me for my dating scan. She asked if I wanted the screening for Downs Syndrome too so I provisionally said yes (not so sure I do want this though).
Just received a letter to say I have a scan booked in a couple of weeks, but that it's for the Downs Syndrome screening. It doesn't mention dating scan at all - will this be a separate appointment?