Have you put Wallington on your state school application? In first place?
As if you haven't then you don't need to be considering it anyway.
It's quite close to us. Understandably hugely competitive.
We looked around on the June/July open evening last year. I've never had to queue outside a school into the street with a ticket before!
We liked the school, girls who showed us around were lovely.
Our daughter is very bright academically so certainly was a consideration for us.
We decided last minute though to not have her sit their tests as talking to teacher/tutor friends we doubted that she'd score high enough to be in the top 100 of the 2000 applicants to get a spot. We knew she'd be sitting for independent schools which we preferred to Wally Girls and didn't want first test to potentially be a fail for her and knock her confidence.
I know it's a very competitive environment and we want a balance of her being helped to reach her potential without the pressure (my school was a hot house and hugely knocked my confidence.)
If you are the sort of parent who will be pushing for Oxbridge/Medicine etc then I'd say it may suit you. If our daughter decides she wants to choose a route like that we'll fully support her, but what she does as a degree/job isn't our top priority for her so wasn't for us.