PM hoax call: 'I had Florence on my back'
David Cameron was out for a family walk when he received a hoax call, claiming to be from the director of GCHQ.
The prime minister revealed details of the incident in an election news briefing on Monday.
Downing Street says it is to review security procedures after Sunday's call.
Mr Cameron told journalists the conversation had been brief, adding: "Every now and again, I suspect these things will happen."