Wow! I didn't expect that! At 6 months pregnant my brain should be shrinking!
For preparation, I read HFE twice which was a good, entertaining introduction. I then bought EJBPlus and SoftSCBCD exam simulators which were invaluable. A good deal of the questions they provide are on a very similar vein to the real thing. I occassionally referred to the spec but don't think my attention span would have lasted to read the whole thing!
The questions on the exam were more straight forward than I had expected and I had plenty of time to double check each answer.
Thanks to all of the HFE contributors and the forum participants who have been very helpful.