While trying to I.D. Oswin's shoes, I found this really good alt available in a few larger sizes than the SA River Island ones (and it's a bit cheaper). Hope this helps someone!
http://www.ebay.com/itm/320895150792?var=510062175183&ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649