Cheers for the fix. I only just got my replacement copy of the book yesterday so haven't had a chance to go through it again yet. Apparently my memory failed me as to the programming. I will drop the increments to 2.5kg and deadlift 3 x week until that fries my back and I change it up.
As for chins, I can proabably do maybe 5 unassisted nowadays if I'm lucky. I guess I'll work on the negatives like yourself and build from there. I kinda interpreted the dips and chins to be additional exercies if desired and my goals currently are to lift 500kg over the 3 main lifts as soon as possible. I'll go back through the book this weekend and adjust my plan with assistance exercises as required.
Cheers again mate, much appreciated.