The Embassy prints all outgoing correspondence on US letter paper, but
I don't know where they get it from. Most of their incoming UK
correspondence (except from a few other embassies, I suppose) must be
on A4 and other DIN ISO sizes, because no-one else in the UK uses the
US sizes. (OK, I've read in this thread that you can in fact buy US
paper in the UK, but I've never seen it for sale, and I like office
supplies.)
--
Oh, I am just a student, sir, and I only want to learn
But it's hard to read through the rising smoke
of the books that you want to burn
[Phil Ochs]