Thank you, Sheldon Brown, for the image.
Helpful tip: A lot of the info that you'll find online about maintaining these old British bikes is written in British English. To help save some confusion at your local bike shop when looking for a specific tool, remember that "spanner" is what the Brits call a wrench. Old Raleigh's use a wrench standard called "Whitworth," but I find that metric wrenches work just as well, even though the fit is a little off. Where I can, I'll often use an adjustable wrench.