David Cameron has unwittingly cited an Iain Duncan Smith parody account in a tweet championing the Government's benefits cap roll-out.
The Prime Minister announced he was working with @IDS_MP - a Twitter user who exclaims "Chin chin old bean" in his profile bio.
Other tweets from @IDS_MP lament the rising cost of foie gras and predict that working class children will grow up to become drug dealers.
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