I can't quite see how you could meet the admissions criteria for all of those schools, tbh, let alone think that all would be suitable for the same child -- they're so different from one another. You really need to go and feel the vibe to get an idea of what you're after, and check the LEA websites v. carefully wrt admissions criteria.
LSU fill all their places with girls from actively practising catholic families. They don't take any non-catholics at all. Good school if you like that kind of thing. V strict and uptight, sometimes a bit excessively so (I know lots of girls who go there). Some lovely girls, but if you're not regularly practising Catholics who are actively engaged in parish life (and yes, you will need baptismal and 1st communion certificates, plus glowing priest's reference), then forget it.
Camden Girls has a tiny catchment area (varies according to ability band, but particularly for the top ability band you need to live on the doorstep, or within a couple of hundred metres). Completely the opposite of LSU in ethos and attitude liberal (no uniform), critical, intellectual and outgoing is the general atmosphere. But tiny catchment we're within easy walking distance of the school, just north of Kentish Town tube, and we're well out of area.
St Marylebone seems like a lovely school, they do lots of art, drama and dance. Complicated admissions criteria, largely based on CoE church attendance iirc.
Parliament Hill has a larger catchment than other popular schools. Don't know much about it though (am doing boys schools atm, girls' schools was 3 years ago for us).