SOLVED! Literature out there is bloody sparse! It's all just 'simply do this, simply do that' !!! Well, most documentation doesn't state that you have to send a start token before EVERY block. It might seem obvious, it might not, but I found one piece which mentioned it in words but omitted it from the timing diagrams!!! ARGHHHHHHHHHHHHH I was dead set on heading home by 6pm. Looks like I'll be going hom 15 minutes early to a flaggon of tea! Hope this helps someone...
If anyone out there has experience on using SD cardss in PicBasic, please get in touch. Might be able to swap ideas!