Mydata,
When I finished my actual flight training about 3 weeks ago, I asked about skills tests. I was told that there was a waiting list and I was number 6!!!!
I couldnt actually "book" a test in advance, I just had to wait for a phone call saying there was a slot free. I didn't actually know I was taking my skills test until 0930 on the day of the test itself! (I had to fly a couple of revision flights between my actually being ready for the test and actually taking it, just to stay current).
As it happens I think it worked out well, because the short notice gave me no time at all to work myself up into a panic about things...
V2