The accusations of Anti-Semitism are a fact, and deserve a mention.  I've expanded the section with more quotes, and references to the recent thesis by Sørsdal, and reorganised to discuss different forms of alleged prejudice in a logical order.  The problem of course is that, shocking as it sounds to the modern ear, "Wot this country wants is a 'Itler" is something English people really did say in the 1930s (as you so rightly point out).  The death penalty issue is a serious topic of discussion in Gaudy Night: I don't know if it should go into the article.