David Cameron spent part of his Tuesday campaigning in Hendon, a Labour-Conservative marginal in north west London.

Here's a picture of the prime minister giving a speech at the Utility Warehouse.

But there's something wrong with the above image. Is it that David Cameron isn't wearing a tie? The look on Boris Johnson's face?

Or is it this man?

This may be the greatest Ukip photobomb ever.

We salute you, Ukip interloper.

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