Hi there Universalis, I have a son AND his friend traveling from SE London to the Vaughan, if that helps.
It was our first choice and we're over the moon!!!!
TBH for us, how well the school was doing academically took precedence over distance. My journey to school took around an hour when I was kid and although not brilliant, I lived to tell the tale. It's also important for me that my DS realises that it's a big world out there.
From speaking to my Mummy mates I've realised that everyone has different priorities. For some it's locality, for others it's the schools results, some will insist on private and many tutored their kids to within an inch of their life to get them into a grammar. There's no wrong or write, you just have to stick with you own values.
If, our local schools results came anywhere close to the Vaughan's then I would have considered it; but they didn't. When it came to GCSE x 5 inc eng and maths, our local was 49% compared to the Vaughan's 94%. For us it was a no brainer.
In any case, I have mates who have kids traveling an 1hr and 20 mins EACH WAY to get to their grammar school and our's won't be that bad:)