I'm looking around for state secondary schools in London for DCs (now years 4 and 2, so planning ahead - we might even end up moving).
Apart from all the normal things you want from a school, (starting with not being a complete hell hole where there are huge fights outside the school gate on a regular basis), I have the preconception that they need a school which offers triple science at GCSE, because as far as I can tell they're both of an academic and scientific bent, and are pretty likely to end up choosing career paths which require this (or at least find it useful).
OTOH I have a feeling that I may be a bit out of date on this, and things may now be different. Does it matter?