Good luck with it all. I actually enjoyed the Pratt books (one of them made me laugh out loud, which is good going for flight training materials).
I would agree that you need to get Air Law done first. It will bore the pants off you, mostly, but it's a necessary evil. By comparison, the others will seem interesting. (One thing to watch: you will have to learn ICAO/JAR rules for the Air Law exam, which may be different from UK ones. That caught me out to start with. The principal thing is VFR minima but doubtless there are others.)
Tim