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.
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The prince laid a floral wreath at one of a group of metal crosses near Wellington Arch in central London.
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The showers will become more frequent as the day goes on, giving some heavy downpours in places during the afternoon.