Oh, it's so simple when you know how.

The mystery of the funny A symbol is solved.

From Blogger: Your template was missing the tag that causes your page to appear with the correct character encoding. I added this to the head section of your HTML:
meta http-equiv="Content-Type"content="text/html;charset=<$BlogEncoding$"

(Obviously I have removed the open and close tags to reproduce it here.)

I tell you this just in case you were fretting about it. You see.

But you know what the mildly frustrating part is? Now they've fixed this for me, none of my previous posts make any sense at all.