I´d really love to take a closer look at unis, too, before finally applying for them, but since I`m residing in germany and I work full time with a really tight schedule, it`ll be hard to go to an Open Day.
Still, I`ve got about five days of my yearly holiday day`s left, so I`m trying to get to London in late November/December and might be able to travel round a bit to look up some of the places independently.