The House of Commons Speaker was forced to intervene during Prime Minister's Questions after rowdy Conservative MPs refused to stop talking during a question about the NHS.
Labour leader Jeremy Corbyn, who was trying to ask the Prime Minister about a possible winter crisis in the health service, was left unable to be heard during the session on Wednesday.
John Bercow, the Speaker, said Mr Corbyn was "entitled to ask questions without a barrage of noise" and that Mr Cameron was similarly entitled to answer them.
Mr Corbyn was unhappy with an answer to his first question on the subject, telling MPs that the PM had "not offered any comment" on the subject when asked.
