A charity whistleblower has confronted UK International Development Secretary Penny Mordaunt as she announced her plan to tackle sex abuse among aid workers at a summit in London.

"We do not need fancy new systems, we do not need technology. We need systematic change," Alexia Pepper de Caires, formerly with Save the Children, said.

Ms Mordaunt stopped her speech to listen to the protester.

She outlined the UK government's plan to work with Interpol to prevent "sex predators" from getting jobs as aid workers, following a series of abuse scandals to hit the sector.

The Guardian paper posted the encounter on YouTube: