Hi Hab 
funny I should see this as currently writing a stroppy reasoned letter on this very subject.
welcome to the school and very interesting that, as a new parent, one of the reasons you chose Darell is that it doesn't have a uniform - sure you are already, but please, please emphasise that on your response as the (weak IMHO) argument from some quarters is that parents are put off by not having a uniform.
I've got two children at Darell and my oldest left for secondary school this year. Like you, as well as the vibrant arts, nurturing environment and ethnic mix at the school, I liked its non-uniform policy.
But - if the majority of parents wanted a uniform, of course I'd accept that as that would be fair, I'm not convinced that's the case, though.
I am concerned about the way information is being presented and that it is not being framed in any context - which makes it pretty useless.
For instance, on the letter sent out it states the opinions of 14 prospective parents (hardly an exhaustive survey) saying why they chose not to send their child to Darell. Interesting that lack of uniform is mentioned first implying that this was the primary reason, That's how some people will read it and even at a sub-conscious level that's what will sink in as it's first on the list.
Maybe I'm wrong, but did parents (all 14 of them) really state the lack of uniform as being of more concern to them than Ofsted reports and standards?
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Oh dear, you've opened up the floodgates now, better get back to my letter to the school 
I really hope your child is enjoying Darell - it undeservedly gets flak at times. But it's done a great job with all three of my very different children.