NHEHS - solid local indie with great results and balance.
SPGS - academically the best and superb teaching/opportunities. As a local, don't like what I see though, rude/arrogant behaviour on the street, smoking by my house, taking over the pavement etc. Not where my daughter is going. Ever.
G&L - again solid, academic without breaking the child, you need to "fit in" to an extent. Nice girls.
LU - best school IMO. Broad mix of pupils, very academic yet look for more, they love personality. No square pegs here, character is celebrated. Lots of sport. Tough to get a place.
FHSSQ - lovely school, small, fits some girls, others may outgrow. Not the most academic at 11 but delivers the goods in own time.
FHCG - bigger and fiestier than Sloane Sq. Slightly more academic. Lively girls, very popular and again delivers.
However, if I were in your shoes and lived in Ealing, I would make life easy and head to NHEHS!