Slaughters seems to be coming up a bit here. Remember it's a really quick a application, so always worth chancing your arm if you might fancy it. They do, however, place a lot of emphasis on academics and it would be an outside shot if those aren't top drawer. Plus, it's an acquired taste.
For those aiming for US, make sure you know the firm's London work inside out. Many of those mentioned have small offices with a relatively narrow focus, you need to be able to explain why you've already settled on that kind of work, rather than going to the MC and getting a chance to try out a broader range of both services and sectors (before moving at associate to a US firm which suits your interests). Plus make clear you're up for the beasting, be that coming back from holiday, working big hours or, as one of our now junior partners did, rearranging your own wedding.
Also, not sure how true this is, but for anyone fancying the ultimate challenge, I heard rumour Cravath may offer a TC this year.