Was surprised about the comments re 31A, ASEA.
Didn't strike me as unusual. I'm sure it's been in many a NA crossword, but you're right. No mention in Chambers, or the Canadian & NA Oxfords. The only refs I found were at Princeton, Miriam-Webster, & this:
http://dictionary.reference.com/browse/asea
It's an old one.
Yes, we should petition Chamber's to include it.
Love their dictionary. Got it a year ago. Don't know how I managed the Speccy before. So many obscure words we don't find over here.