Thanks for your advice with this. With our surname beginning with W, I suspect that if she does sit it at Chelmsford she might have to wait until the afternoon. That's something I'm keen to avoid as I think it would make for a very stressful day!
I also didn't realise that they take it in a classroom rather than the hall. That sounds a much better idea to me. My daughter didn't think it was a good idea for her to sit the exam at Westcliff because there was too much in the hall for her to be distracted by!
My son sat the test in the afternoon last year. His older brother had a morning start back in 2004. We actually preferred the afternoon slot (son doesn't do early mornings anyway - well, not until he got his place, now has no choice!).
We had a nice leisurely morning and had time for brunch of bacon and eggs, followed by a walk through the park for that all important fresh air fix. It actually felt a lot less stressful than getting up early and just having enough time to grab a quick bite and then get off to school. I do appreciate some may prefer the early option as it is less time to think about the approaching test, but just wanted to say not to worry if you get an afternoon slot, just plan what you'll do during the morning and make it a special time.
Best of luck.