Thanks for the feedback.

I wrote this to help me better understand the material when I first came across it. It was sitting doing nothing on my computer for a year and so I decided to just post it. I hope it will be useful as an article for a few beginners.

I agree I should try and make the work more engaging and I have recently read Made to Stick, On Writing Well and Elements of Style to give me ideas on how to improve my writing. I still find it very difficult and time consuming.