Good luck for all applying. Slaughters is a great firm. If you do get on the scheme, make sure you don't get taken in by the graduate recruitment spiel. Make sure you could really see yourself working somewhere with a culture like Slaughters. If you do, then that's wonderful!
Another point to make, is that the firm will make a big play about how you should pick them over US/magic circle/more elite firms, because they do interesting work and have a better work life balance. Yes they do interesting work, but there are so many trainees you may not get to do anything on those cases. Secondly, the working hours are no better than other firms that pay £120/130/140k NQ.
As with all recruiting events. Take everything with a pinch of salt, and check out other options before making your decisions .