@tomkirkman, do you fancy doing a bike maintenance session on bottom bracket/chainset etc. soon? I finally have this part of my bike dismantled completely, and need to reassemble it, so it seems like a good opportunity to use this ready-to-go “visual aid” to demonstrate how to correctly install a new bottom bracket cassette.
I now realise that you don’t leave the bottom bracket bearing cassette to rust in the frame until it needs renewal; I had to pay Herne Hill Cycles to remove mine. It took two men, a tommy bar, and a really ingenious special tool. They were very decent about it; the only comment was, “Well it was in there wasn’t it?” 
