Could anyone please tell me how to view the wiki source of an entire month's archive, rather than article by article?
You'll need to copy those template inclusion lines somewhere else, and put subst: in front of each.
Like this: {{subst:Wikipedia:Featured article candidates/Benjamin Mountfort}}
You could do that in the sandbox, or on a sub page of your user space. After you've saved it like that, the text will be substituted into the page, rather than included via the template mechanism.
It makes a very long page, so you should dump it as you get what you need. I did it in the sandbox for the page you mentiond, see http://en.wikipedia.org/w/index.php?title=Wikipedia:Sandbox&oldid=115160...
Ben