I don’t remember well, but if the few Japanese builds were early 2010/2011 ones, we could mark all 2012+ ones as UK-built? I don’t think any Japan-built post-facelift ones was found?
Out of curiosity I checked a couple of Italian press cars and they were both UK-built (plates EF911KS and EF864KY, respectively November 2010 and January 2011).