The Health Protection Agency (HPA) has been notified of an outbreak of food poisoning linked to an establishment in Havering. One person has died after being admitted to hospital.
Around 30 people have reported symptoms of gastrointestinal illness after eating at the venue on Christmas Day.
Laboratory testing has confirmed the presence of Clostridium perfringens bacteria in a number of samples submitted by those experiencing symptoms, including the patient who died.
More top news
London Ambulance Service has more paramedic job vacancies than anywhere else in England.
Hundreds of people march for more affordable homes and control private rents in London.
Police proposals suggest that all frontline police officers should have the option of arming themselves with Tasers.