Okay well I got back and I think it went okay
Got there about 30 mins early but the time you book it doesn't matter because you start it whenever you arrive and there's a computer available.
You get directed infront of a computer with the LNAT tutorial and then you start the test.
It's EXACTLY like the practise test on the LNAT website so give it a go.
The questions for both the multiple choice and the essays seem to be downloaded from the LNAT center as you do it...
Why do I say seem? Because each time I clicked next, the screen would take a while to refresh, the computer couldn't possible be that slow to just be loading the next page. On top of that, I took the test at the same time as my girlfriend and we both got different questions, though one of our essay questions was the same but in a different slot.
If I had a tip to give... Practise the LNAT one, it really is the same, I found that mine was easier but my girlfriend found hers easier so the difficulty is pretty much the same, it just depends on how well you understand the texts. If you fall on a style of writing you understand well or a topic you're half-knowledgeable about it makes it alot easier than something political and written in very formal/old english. Read the newspaper to read different types of writing, some similar to the LNAT things. (proper newspapers, guardian, times, independent ect)
Time-wise, I was fine, finishing a full half-an-hour early on the multiple-choice and ten minutes early on the essay (though now I think about it I'm sure I could've put those 10 minutes to good use, don't do the same mistake :P) but if you're REALLY tight for time, you could ATTEMPT to click previous and next a few times while you think. The loading of a new page takes 4-5 seconds and the timer is paused during that time. I haven't tested this, maybe clicking back once it's loaded is faster but oh well, just a thought.
Oh... and don't steal the board and pen you're given to write a scrap on or whatever, it's considered ill-conduct and they'll fail you :P
(anyone know why my signature isn't showing up? :P)