Not the full shilling
"Not very intelligent, or not quite right in the head."
A pre-decimal currency joke. Under the old system, a shilling was worth twelve pence, and being handed a coin, or a person, that came up short implied something was missing that should have been there. "Not the full shilling" used that everyday image of being short-changed to describe someone thought to be lacking in wits, and the phrase has outlived the coin itself by decades.
Sources: Recorded in British slang from the mid-20th century, cited in slang dictionaries including Partridge's Dictionary of Slang.
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