I don't know if this is too late but if your getting the 600Q UKCAT book get the one that says "how to get into medical school", it has a blue cover. Reason i say this is because there is also another 600Q book with a similar name but from hearing reviews, it is not that good.
I still haven't done my UKCAT or BMAT exam yet, any suggestions on which book will be excellent for helping me and perhaps other sites that are able to guide me through exam practice questions?