hi Ab1de - your 2nd sentence did make my eyes shoot out of my head with confusion and wonder if we're in 2012 without me noticing!
I stand by what I said, I've got/recently had DC in all the schools I mentioned and have also worked at one of them. And I've just double checked some of my info to make sure I'm not spouting rubbish!
My son was in pre-prep at Abingdon Prep, which is where the problems have been, rather than the prep where I think it improves. We're one of the families who took our son out in past few years; he just wasn't being stretched enough. We've found MCS much better for meeting his individual needs. We have another son who will probably go to Abingdon Prep though, as it'll suit him more to be near top of class there rather than middling at MCS, as long as new head addresses a few of our concerns about lack of organization which always drove me mad. I liked him when I met him.
By "official feeder" I don't of course mean that it is the only feeder school. Just that the Manor is the official feeder to Helkats just as AP is to Abingdon - see
www.abingdon4education.org.uk/. Its not advertised, but the Manor actually gets a set amount of places each year, so they confidently can tell parents whether or not their girls are likely to get a place, depending on their position in the year (determined by CAT tests in the year prior to entrance exams.) Which isn't to say that other schools don't also feed to Helkats of course.... its bigger than the Manor, for a start! But the number that get into Helkats from the Manor is significantly higher than any other school (I've just checked "leavers destinations" for the applicable schools the league tables to make sure this is still correct and it is.)
I agree with you that the state schools you mention are very good - in particular St Nick's in Abingdon; our financial advisor tells all his Abingdon clients not to waste their money on pre-prep, as long as they can get a place there! Alas, we couldn't, but also had other reasons for choosing independent from the start, including the wraparound care.
For the OP:
The weakness with Helkats is the sport. Very sporty girls troop off to Headington instead, and I can understand why. Still much better than at one of the Abingdon comps, of course, but way behind a lot of girls independent schools. Hopefully by the time you're choosing for your DD, they'll have managed to improve it.