Dates
You wrote "Rationalise non-US date formats in non-US article", but if your date preferences are enabled, these dates would look the same in any case. I was interested as I have been trying to take out the many linked stand-alone years in Wikipedia; most often they add nothing to the article. It has been fairly controversial though; some users like them in some articles and there is no coherent policy.  

Removing standalone wikiyears is current policy, according to WP:DATE. Complete dates should be wikilinked so that they show up correctly according to user preferences. However, those readers who have not established accounts will see the dates presented as entered, and it is preferable that U.S. format dates be kept out of non-U.S. articles.