The Oxford Union has apologised after advertising a colonial "reparations debate cocktail."

A poster for the cocktail, which cost £2.50, showed a slave's hands in chains above the caption which said: "The colonial comeback."

The cocktails were being served during a debate on Thursday night on whether the UK should pay reparations to countries in the Commonwealth, which were formerly colonies.

It has been reported that one of the world-famous debating society's black and minority ethnic officers, Esther Odejimi, has resigned as a result of the poster.

Speaking to student newspaper Cherwell, she said: "I'm disgusted at the way they have behaved, both towards me, and the wider black community."

The Oxford Union posted a public apology on Twitter and Facebook, which said: "The union would like to apologise for the cocktail last night.

"The individual responsible has apologised and deeply regrets their actions.

"This was an error of judgement and will not be repeated."

Union member and student Risham Nadeem said: "A colonial comeback cocktail complete with slave imagery is unforgivable."

The Oxford Union, for Oxford University students, is the second oldest debating society in the English speaking world, and is renowned for attracting famous speakers.

Last year, members of Fight Against Fascism protested against the union's decision to allow former English Defence League chairman Tommy Robinson to speak at the building in St Michael's Street.