Martin Gibson, I would have responded earlier, but I have guests in town..I did notice that CarolC did what I would have done, which is to show you where to go online for this information...here is yet another one-(Website is titled "Judaism 101", and if you want more, just Google "Commandments of Judaism"...not all that difficult or obscure)

http://www.jewfaq.org/613.htm

which I had bookmarked for myself a while ago, since I've been reading these on and off for most of my life, trying to make sense of why there are so many. It's because Jews like to nit-pick, especially when it comes to interpretation of the Torah. Since you are also a fan of nit-picking, it is unfathomable to me that you didn't know about this before. You say you've been studying Judaism since you were young? Hmmm.