This is a great thread you started Ian. After 2.5 years as a technician I can say adding to the tool collection is never over. Once In a while a new tool shows up and you wonder how you managed without it before.
So I will add a few things and likely be adding more to this thread in the future.
JIS screwdriver, not the same as a regular Phillip's, flush cutters, I ground the ball ends off my extra set of hex keys. Great for holding a sockethead capscrew and guiding it in it's hole.