A favourite of my dad... 'As rare as rocking horse sh*t'
I've not noticed any 'A useful as...' colloquialisms yet. May I add...
As useful as a chocolate teapot
...and...
As useful as a condom machine in the Vatican
And also (the blackadder version of) Sir Arthur Wellesley once said
Give 'em and inch and they'll take a foot, any more than that and you don't have a leg to stand on.
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