I am interested in the answer to this too as induction has already been mentioned to me if baby continues to measure on the large side (6 weeks ahead at 28 weeks).
I do think you should bear in mind that growth scans are not overly accurate. I had one at 37 weeks with ds1 and was told my baby was going to be over 10lb at term. He was 8lb 1oz 8 days late. You don't have to opt for an induction just becausr they suggest it based on a growth scan (if they do suggest it). As you can see from my experience, they aren't always right!
The growth scans are notoriously inaccurate IME. With dd I was measuring anything up to about 6cm bigger than I should have. The growth scan showed that she was enormous, with some of the measurements being off the scale. Instead she turned out to be the smallest of my 3.
When I was pg with ds2 (now 5yrs old) he was induced 2wks early. He weighed 9lbs. By the time I had dd (now 2yrs old) the policy had changed and the earliest a baby would be induced would be on the due date.
Different hospitals may have different policies though.
i measured big all through and at 37 weeks still measured (scan & fundal height) big and consultant didn't offer me an induction(38 weeks normally) stating they don't always succeed and i had an elective cs at 39 weeks. big babies tend to stay indoors longer btw! it was the right choice.
missusH, do you think your midwife can get you an appointment with a consultant after your growth scan rather than go to the DAU at least then you can get a decision there and then?