There are so many bits I'd love to quote, except that it all grew and got a bit ridiculous, so I'll just say that I loved this and leave it at that.

Except that TimTam sharing = True Love. And I love the squished worms as highlighter metaphor.

Now I can see the scientists keeping the worms and then somehow making them into highlighters. I can see the glee with which they fall upon their new highlighters (the old ones are bound to dry out or get used up). They'd be called Wormlighters, until someone remembers that Ford isn't allowed to name anything.