David Lammy has spoken of his own “traumatic” experience of being racially abused at school as he called on Nigel Farage to apologise for comments he allegedly made while a teenager.

Lammy, the deputy prime minister and justice secretary, said the testimony of more than 20 of the Reform leader’s school contemporaries of his racist and antisemitic behaviour was “deeply troubling”.

Farage has faced repeated calls for a show of contrition after a Guardian investigation into his time at Dulwich college, in south-east London, but he is yet to apologise.

He has denied that anything he did as a young man was “directly” racist or antisemitic while conceding that “banter” then could be interpreted differently today.

Lammy, 53, whose parents, David and Rosalind, came to the UK from Guyana, c

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