All - just FYI, I have lodged an errata submission with the publisher, it's not massive, but just incase it helps someone, here you go:
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Ch 4, page 105:
In the section "Time for action - adjusting the drop location of the statue", numbered point 4 has an error. It reads "On the left hand side of the new camera+... block [...]" This should in fact say, "On the left hand side of the new 0 + 0...block [...]". The "camera+" block is not added until step 6, step four is the start of the process to add this block.
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Enjoying the book so far.