Mr Cameron visited McKanna Meats in Bloomsbury, central London, and hand delivered a letter which urges the company to check whether it is entitled to the £2,000 National Insurance break.
He spent about five minutes chatting to a partner in the butcher's, Graham Morley, and also bought some sausages. Speaking afterwards, Mr Morley said he was not sure how much difference the tax break would mean to his business.
More top news
"Vibrant and funny" teenager opted to donate her organs after becoming seriously ill in a "final act" of generosity.
Three men have been sentenced to a total of 31 years for their role in a 'crash for cash' plot which led to the death of a great grandmother
She met with the families of children who must stay near the hospital.