I would say they are not uncommon in BrE.
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Mr. TomCrabby = irritable = Don't be so crabby.Very common in the US. I've heard it all my life, and it doesn't seem to be losing popularity.
Mr. TomTurn a hair (idiom)Never heard it. What is it supposed to mean?
fivejedjondid not turn a hair when told of the savage murderHmm. OK. I don't suppose it's used in the affirmative then.
CalifJim I don't suppose it's used in the affirmative then.Correct.
CalifJim I thought it might be related to "didn't touch a hair", which I hear in the US from time to time, but it isn't.Does it mean 'not http://www.macmillandictionary.com/dictionary/british/harm_1 someone in any way
Mr. Tomwhich meaning you had in mind when you discussed go over one's head.The second definition.