They're changing it so there's no longer a 13+ entry, presumably because the boys coming in at that stage weren't as academic as those coming in at 11. That means they'll be far more places on offer for y7 which is a good thing.
I think there's about 120 in the year from y9.
It was lower than City this year in the league tables (City was amazingly high) but I think for the past few years it's been the higher one. It's much of a muchness for schools like City, Highgate and UCS as they're all close enough for the differences to be down to individuals rather than systematic. I don't think it's slipping down at all.
It's definitely seen as 'second-tier' relative to St Paul's and Westminster, but it depends what you're after. We wanted a local-ish school so didn't apply to those others, plus we liked the fact that it didn't feel so 'public-schooly'. Like City, it's got an independent day school feel rather than a faux-tonian vibe. We choose it above City mostly because we liked the head more (City had that female head who promptly left) and the grounds/fields. We'd have been happy with either to be honest.
I think that scruffy uniform thing is a bit exaggerated, but the school is privileged enough not to have to worry about being strict about sock length which was another thing we liked. Our state alternative was one of those academies that measures how many stripes are visible on ties. We also liked the fact that there's absolutely no uniform in sixth form. I hate that 'business attire' code as it doesn't seem to be treating pupils as being in a transitional phase between school and university.
What can I say, we're happy with it but no doubt would have been happy with others too. I think one can angst too much - they're all ridiculously privileged, academic places and I'd prioritise ease of journey/friends' locations above league tables.