Thomas Chambers walked up to the Labour leader during an event at Gloucester University on Saturday and asked him to sign a folded up piece of paper.

He then unfurled the A4 sheet with Mr Corbyn still stood next to him to reveal an image of the 70-year-old wearing a Soviet t-shirt with the caption, ‘I support terrorists and I am an anti-Semite. Also I am on Iran TV payroll.’

The prank was filmed by Mr Chambers’ former Labour-supporting father, Alastair, 38, and obtained exclusively by The Sun.

Surprisingly, neither Mr Corbyn’s security nor his supporters appeared to notice what had happened.