How did Spud know?
I've been wondering: How did Spud know that Renton left his share of the money in that "locker/safe"? It's never mentioned. I mean, I know there are several possibilities such as Renton leaving him a note, having told him before about it, calling him etc. which were just not shown onscreen.
Nevertheless, I always found that part interesting (especially when considering that Renton must have kept it (somewhat) secret as it was his hiding place for things he didn't want Sick Boy and Begbie to have access to).
What are your thoughts on this or is there maybe some explanation in the book?