Looking for secondary schools in North London/Herts

I'm looking into secondary schools for my daughter, who has developmental delay. We want to find out about any special schools, or mainstream schools with an SEN unit, maintained or independent, that might be possible for her. We live in Radlett, Herts.

So far we've identified The Collett School, Garston Manor, St Luke's, Alfriston, Bushey Meads, Shaftesbury High School and Egerton Rothesay. Does anyone have any views about any of these schools? Can you suggest any others?

I'm not looking for general advice on how to find a secondary school (I work in special needs so I'm pretty clued up, I hope) - what I'm really hoping for is specific info and opinions about particular schools.

Thanks very much!

Karen