The London Assembly's Health and Environment Committee will hear opinions from a range of experts about proposed cuts to accident and emergency units later. Seven hospitals are under threat across the capital.
NHS hospitals in London are to be encouraged by the government to sell their services abroad to raise money for patients in the capital.
Great Ormond Street and the Royal Marsden are among those to be invited to set up branches overseas.
But opponents say the only focus of an NHS hospital should be to treat patients on the NHS.
Our Health Correspondent Liz Wickham has the details.